Neutral Density
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 67mm ND Fader Neutral Density Adjustable Variable Filter ND2 to ND400 $13.60 Time Remaining: 23d 23h 1m Buy It Now for only: $13.60 |
 Tiffen 66x66 ND Neutral Density 12 Filter w Pouch Used but MINT $200.00 Time Remaining: 37m |
 POLAROID VARIABLE FADER ND 58mm NEUTRAL DENSITY FILTER $34.99 Time Remaining: 29d 21h 23m Buy It Now for only: $34.99 |
 Hoya Pro 1 Digital 77mm ND 32 Neutral Density AUTHORIZED HOYA USA DEALER $63.50 Time Remaining: 25d 4h 58m Buy It Now for only: $63.50 |
 72mm Variable ND Filter ND2 TO ND400 Neutral Density For canon 28 135mm 18 200mm $19.99 Time Remaining: 55m |
 Fotga 62mm slim fader ND filter adjustable variable neutral density ND2 to ND400 $18.98 Time Remaining: 24d 10h 24m Buy It Now for only: $18.98 |
 Tiffen 62mm ND8 09 Neutral Density 3 stop Filter 62ND9 USA Authorized Dealer $23.95 Time Remaining: 10d 1h 44m Buy It Now for only: $23.95 |
 VIVITAR SERIES 1 VNDX 77MM NEUTRAL DENSITY VARIABLE ND2 TO ND1000 FILTER NEW $99.95 Time Remaining: 2d 20h 18m Buy It Now for only: $99.95 |
 58mm Variable ND Filter ND2 TO ND400 Neutral Density For Nikon 55 300mm Pentax $14.99 Time Remaining: 54m |
 POLAROID VARIABLE FADER ND 52mm NEUTRAL DENSITY FILTER $34.99 Time Remaining: 26d 11h 8m Buy It Now for only: $34.99 |
 Super Slim 77mm ND Filter Neutral Density ND400 Optical Glass $20.00 Time Remaining: 21d 2h 24m Buy It Now for only: $20.00 |
 Tiffen 77mm Neutral Density 09 ND 8 AUTHORIZED TIFFEN USA DEALER $42.95 Time Remaining: 26d 18h 48m Buy It Now for only: $42.95 |
 25mm Neutral Density ND 2 filter for Camera lens US $8.00 Time Remaining: 29m |
 6pcs Graduated Neutral Density ND Color filter set for Cokin P Series Camera LF3 $18.89 Time Remaining: 1d 8h 7m Buy It Now for only: $18.89 |
 Cokin U960 Graduated ND Neutral Density Z PRO Filter Kit Z121L Z121M Z121S $301.31 Time Remaining: 7d 1h 9m Buy It Now for only: $301.31 |
 72mm ND Fader Neutral Density Adjustable Variable Filter ND2 to ND400 $14.38 Time Remaining: 29d 41m Buy It Now for only: $14.38 |
 30mm Neutral Density ND 2 filter for Camera lens US $8.00 Time Remaining: 33m |
 Hoya HMC 72mm ND 400 Neutral Density MC AUTHORIZED HOYA USA DEALER $94.90 Time Remaining: 2d 7h 59m Buy It Now for only: $94.90 |
 VIVITAR FILTERS 77MM UV+CPL Polarizer+ND8 FUNDAMENTAL Neutral Density FKND 77 $21.44 Time Remaining: 26d 23h 35m Buy It Now for only: $21.44 |
 New Landscape Neutral Density ND8 Gray Filter for Cokin P Series F3F $2.48 Time Remaining: 20d 2h 20m Buy It Now for only: $2.48 |
 30mm Neutral Density ND 2 filter for Camera lens US $8.00 Time Remaining: 36m |
 Slim 77mm Fader ND Filter Neutral Density ND2 to ND400 $23.85 Time Remaining: 14d 1h 54m Buy It Now for only: $23.85 |
 Slim 58mm Fader ND Filter Neutral Density ND2 to ND400 $18.45 Time Remaining: 28d 8h 30m Buy It Now for only: $18.45 |
 Fotga 77mm slim fader ND filter adjustable variable neutral density ND2 to ND400 $24.64 Time Remaining: 24d 10h 33m Buy It Now for only: $24.64 |
 43mm Neutral Density ND 2 filter for Camera lens US $9.00 Time Remaining: 49m |
 Professional 67mm Neutral Density ND4 Filter Double Thread ND 4 $4.39 Time Remaining: 6h 2m Buy It Now for only: $4.39 |
 58mm 58 mm ND 8 ND8 Neutral Density plexiglass Filter $3.99 Time Remaining: 24d 7h 34m Buy It Now for only: $3.99 |
 Hoya PRO1 Digital ND32x Neutral Density 15 Filter 77mm USA Authorized Dealer $63.50 Time Remaining: 24d 23h 40m Buy It Now for only: $63.50 |
 37mm Neutral Density ND 2 filter for Camera lens US $9.00 Time Remaining: 40m |
 58mm GRAD ND FILTER GRADUATED NEUTRAL DENSITY NEW $15.99 Time Remaining: 17d 1h 30m Buy It Now for only: $15.99 |
 Hoya 77mm PRO1 NDx16 ND 16 Neutral Density Filter 77 mm Made In Japan Genuine $63.90 Time Remaining: 9d 1h 12m Buy It Now for only: $63.90 |
 DHD NEW 52mm 52 mm Neutral Density ND 8 ND8 Filter $4.59 Time Remaining: 7d 8h 4m Buy It Now for only: $4.59 |
 37mm Neutral Density ND 2 filter for Camera lens US $9.00 Time Remaining: 42m |
 Vivitar 72mm Neutral Density Variable Fader NDX Filter ND2 to ND1000 VNDX 72 $42.95 Time Remaining: 19d 19h 36m Buy It Now for only: $42.95 |
 67 67mm Neutral Density ND2 ND4 ND8 ND 2 4 8 Filter Set $15.18 Time Remaining: 7d 6h 15m Buy It Now for only: $15.18 |
 52mm Fader Variable ND Filter Neutral Density ND2 ND4 ND8 ND16 ND32 to ND400 $19.88 Time Remaining: 15d 5h 58m Buy It Now for only: $19.88 |
 43mm Neutral Density ND 2 filter for Camera lens US $9.00 Time Remaining: 52m |
 3 pcs 3pcs Gradual ND2+ND4+ND8 Neutral Density Filter 3 case Kit for Cokin P $11.98 Time Remaining: 16d 45m Buy It Now for only: $11.98 |
 Zykkor 43mm Neutral Density Filter Kit ND2 ND4 ND8 ND $19.95 Time Remaining: 4d 19h 38m Buy It Now for only: $19.95 |
 77mm 77 mm ND 8 ND8 Neutral Density plexiglass Filter $5.69 Time Remaining: 2d 16h 34m Buy It Now for only: $5.69 |
 46mm Neutral Density ND 2 filter for Camera lens US $10.50 Time Remaining: 56m |
 Tiffen 58mm Neutral Density 09 ND 8 AUTHORIZED TIFFEN USA DEALER $17.67 Time Remaining: 26d 23h 4m Buy It Now for only: $17.67 |
 Slim 72mm Fader ND Filter Neutral Density ND2 to ND400 $22.90 Time Remaining: 28d 8h 31m Buy It Now for only: $22.90 |
 Tiffen 49mm Neutral Density 09 ND 8 Filter AUTHORIZED TIFFEN USA DEALER $15.95 Time Remaining: 27d 16m Buy It Now for only: $15.95 |
 46mm Neutral Density ND 2 filter for Camera lens US $10.50 Time Remaining: 56m |
 3pcs 52mm ND2 ND4 ND8 ND 2 4 8 Neutral Density Lens Filter Set for Nikon LF60 $8.99 Time Remaining: 13d 4h 27m Buy It Now for only: $8.99 |
 Slim 52mm Fader ND Filter Neutral Density ND2 to ND400 $17.56 Time Remaining: 16d 6h 4m Buy It Now for only: $17.56 |
 Lens Filter Pixco ND8 405mm Neutral Density Filter $9.80 Time Remaining: 10d 7h 45m Buy It Now for only: $9.80 |
 SINGH RAY GRAD ND NEUTRAL DENSITY 06 2 STOP SOFT STEP 4 x 6 inch FILTER $120.00 Time Remaining: 23h 47m |
 58mm Fader ND Filter Neutral Density ND2 to ND400 for Canon XT XTi T2i T1i $19.99 Time Remaining: 28d 21h 21m Buy It Now for only: $19.99 |
 NewND2 + ND4 + ND8 67MM Neutral Density Filter 67 MM $11.62 Time Remaining: 2d 4h 30m Buy It Now for only: $11.62 |
 58mm Neutral Density 8x ND8 Filter Double Thread 58 mm New $3.35 Time Remaining: 29d 4h 55m Buy It Now for only: $3.35 |
 67mm VIVITAR Neutral Density 2X ND 3 Camera LENS FILTER $4.99 Time Remaining: 1h 11m |
 Tiffen 55mm Neutral Density 12 ND 16 Filter $15.95 Time Remaining: 27d 23h 32m Buy It Now for only: $15.95 |
 Lee Neutral Density 9 Graduated Soft Filter 6x4 Resin 9NDGS $94.90 Time Remaining: 29d 9h 57m Buy It Now for only: $94.90 |
 Tiffen 67mm Neutral Density 12 ND 16 Filter $23.95 Time Remaining: 11d 2h 6m Buy It Now for only: $23.95 |
 49mm Neutral Density ND 2 filter for Camera lens US $10.50 Time Remaining: 56m |
 Graduated Grey 58mm Graduated Neutral Density ND 58 mm Grey Filter Half Grey $4.21 Time Remaining: 28d 14h 49m Buy It Now for only: $4.21 |
 82mm ND Fader Filter ND2 to ND1000 Neutral Density $53.99 Time Remaining: 27d 18h 3m Buy It Now for only: $53.99 |
 Tiffen 77mm Neutral Density Filter Kit ND 06 09 12 77NDK3 Authorized Dealer $114.95 Time Remaining: 18d 18h 15m Buy It Now for only: $114.95 |
 49mm Neutral Density ND 2 filter for Camera lens US $10.50 Time Remaining: 1h 1m |
 77mm Fader Variable ND Filter Neutral Density ND2 ND4 ND8 ND16 ND32 to ND400 $25.88 Time Remaining: 15d 5h 59m Buy It Now for only: $25.88 |
 NEW 58mm Neutral Density ND2 Filter Double Thread 58 mm $3.34 Time Remaining: 8d 3h 38m Buy It Now for only: $3.34 |
 Vivitar 37mm Series 1 Variable Range Neutral Density ND Camera Lens Filter NEW $19.95 Time Remaining: 19d 14h 23m Buy It Now for only: $19.95 |
 SINGH RAY 4 X 6 inch NEUTRAL DENSITY 2 STOP 06 SOLID 100 X 150mm FILTER $120.00 Time Remaining: 23h 42m |
 52mm 52mm Neutral Density ND4 Filter for 52mm lens of camera kit J016 $3.65 Time Remaining: 10d 7h 10m Buy It Now for only: $3.65 |
 82 mm ND Fader Neutral Density Adjustable Variable Filter ND2 to ND400 $19.15 Time Remaining: 8d 55m Buy It Now for only: $19.15 |
 Full Color Grey Square Filter ND16 Neutral Density Filter for Cokin P series New $3.90 Time Remaining: 3d 20m Buy It Now for only: $3.90 |
 55mm Neutral Density ND 2 filter for Camera lens US $10.50 Time Remaining: 1h 9m |
 New Super Slim 58mm Fader Neutral Density ND Filter ND400 Optical Glass $17.00 Time Remaining: 10d 8h 1m Buy It Now for only: $17.00 |
 Tiffen 58mm COLOR GRADUATED ND 06 Filter 58 mm Grad Neutral Density $43.40 Time Remaining: 28d 10h 15m Buy It Now for only: $43.40 |
 Tiffen 52mm Neutral Density 09 ND 8 AUTHORIZED TIFFEN USA DEALER $15.95 Time Remaining: 26d 22h 51m Buy It Now for only: $15.95 |
 72mm Variable ND Filter ND2 TO ND400 Neutral Density For Nikon 18 200mm canon $19.99 Time Remaining: 1h 36m |
 Opteka 86mm HD Variable Neutral Density Fader ND Filter $39.95 Time Remaining: 2d 19h 20m Buy It Now for only: $39.95 |
 Graduated square filter kit with ND2 ND4 ND8 neutral density for Cokin P Series $13.99 Time Remaining: 16d 17h 56m Buy It Now for only: $13.99 |
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Flexible LED Strip Light L Section - high density - neutral white
Sale Price: $6.99  |
DescriptionFlexible LED Strip Light L and T Sections are the perfect accessory for an LED light installation where continuous light is needed. T Sections are perfect when two LED strip light sections running at right angles to each other need to be joined... |
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High Density Flexible LED Strip Light spool - copper finish - neutral white
Sale Price: $209.99 |
DescriptionOur High Density Flexible LED Strip Light Spools include 16.4 feet at a price that's 20% off the by-the-foot price. High Density Flexible LED Strip Light is super bright LED strip lighting that has twice as many LEDs as our Flexible LED Strip Light... |
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Double Wide High Density Flexible LED Strip Light spool - neutral white
Sale Price: $399.99 |
DescriptionDouble Wide High-Density LED Strip Light is a super bright LED strip that is twice as bright as our High Density LED Strip Light and four times as bright as Flexible LED Strip Light. Sold by the 16.4 foot spool at 20% off the by-the-foot price, you won't find a better value for the lumen output... |
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Completing Your Outdoor Photography with Landscape Filters
List Price: |
DescriptionThis workshop is designed for the intermediate to advanced amateur photographer. Learn how to get the most from your outdoor photography with landscape filters and take your images to the next level. Featuring outdoor & active lifestyle photographer Adam Barker, Completing Your Outdoor Photography introduces the most useful filters for landscape and nature photography... |
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Celestron 94304 Nine-Piece Accessory Kit
List Price: |
DescriptionThe Celestron 94304 Nine-piece Accessory Kit will help you get the most out of your telescope. While most telescopes come with one or two eyepieces to get you started, this kit will greatly improve the enjoyment of your new scope with additional eyepieces, color filters, and an extremely handy 2x Barlow lens... |
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Celestron Solar Filter Mylar for C4 R/FirstScope/102AZ
List Price: |
DescriptionCelestron Solar Filters are made with Baader Astro Solar Safety Film. Far superior than any existing glass, Mylar or polymer filters, they lead to brighter, sharper, and higher contrast images. Enter the new millennium with the finest solar filters available... |
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Focal Polyglass 165 VR 6.5-Inch 2-Way Component Speaker Kit
List Price: |
DescriptionThe 165 VR is a 6.5-inch, two-way speaker kit from Focal's Polyglass VR line. Included are the 6 VR woofer, an Aluminum/Magnesium inverted dome tweeter and a separate crossover. The 6 VR offers extremely high efficiency, and its 94... |
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New 2PCS UltraFire Li-ion 3.7V 18650 3000mAh Rechargeable Battery For Camera Toy Flashlight
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DescriptionIf you are not satisfy with something, please don't leave us negative or neutral feedback right away. Please contact us via email. make every customer get good mood with fine shopping experience here... |
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New 20 x CR1616 DL1616 BR1616 ECR1616 KCR1616 L11 Cell Coin Button Battery
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DescriptionWe have always been trying to provide the best service and reliable products for every customer.If you are not satisfy with something, please contact us via e-mail to resolve any issue before leaving a negative feedback or neutral feedback... |
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Crystalcity-6662 10 X Cr1616 Dl1616 Br1616 Ecr1616 Kcr1616 L11 Cell Coin Button Battery
Sale Price: $1.35 |
DescriptionWe have always been trying to provide the best service and reliable products for every customer.If you are not satisfy with something, please contact us via e-mail to resolve any issue before leaving a negative feedback or neutral feedback... |
How Homeowners on Well Water Use Calcite (Crushed Marble) to Neutralize Corrosive Well Water
Crushed marble, also known generically as calcite, is a naturally occurring calcium carbonate media that is crushed and screened. It can be used inexpensively to neutralize acidic or low pH waters to a neutral, less corrosive condition.
For homes that use well water, one of the most common causes of copper pipe corrosion is low pH, also known as acidic water. A low pH is water with a pH of less than 7.0 pH. Signs of acid water are corrosion of fixtures, leaking water heater tanks, pinhole leaks, blue staining (from copper pipes) or rust staining (from iron pipes).
Common causes for acidic water are acid rainfall due to atmospheric carbon dioxide and other airborne pollutants, runoff from mining spoils, and decomposition of plant materials.
One of the advantages of calcite or crushed marble is its self-limiting property. When used properly, it corrects pH only enough to reach a non-corrosive condition. It does not overcorrect. Upon contact with the crushed marble, acidic waters slowly dissolve the calcium carbonate to raise the pH thereby reducing the potential leaching of copper, lead and other metals found in typical plumbing systems.
Calcite typically has a density of 100 pounds to one cubic foot and is near white in color. The mesh size most commonly used in neutralizer filters is 16 x 40. The composition of this natural mineral is 95% calcium carbonate and 5% magnesium carbonate.
To correct low pH on a home water system, calcite is used in a filter tank similar in shape to a water softener or iron filter tank. Common tank sizes for homes are 10" to 13" in diameter by 48" to 54" in height. A filter gravel support bed is typically used beneath the calcite.
Depth of the calcite bed will vary but a minimum bed depth of 24" is recommended. Periodic backwashing will prevent packing, reclassify the filter bed and maintain high service rates.
The service flow rate recommended is 2 to 6 gallons per minute per square feet of calcite filter bed area. For example, a 13" tank is about 1 square foot. Even though the service flow rate is 2 to 6 gallons per minute, much higher intermittent flow rates can be realized and adequate neutralizing of the water still take place.
If the neutralizer filter is run continuously or for several hours at one time, say in filling a storage tank to serve multiple homes, the service flow rate of 2 to 6 gallons per minute should be used. For homes however a peak flow rate of 15 to 20 gallons per minute per square foot can be realized.
The backwash flow rate recommended is 10 to 12 gallons per minute. Depending on pH, water chemistry and service flow, the mineral bed will have to be periodically replenished as the Calcite is depleted.
In addition to being an excellent acid water neutralizer, this type of calcite is also an excellent filter media and can remove sediment and particles down to the 30 micron range in size. During the backwash cycle, the trapped sediment is flushed to drain, eliminating problems with pressure drop through the filter bed.
Calcite media is best used when the water is low in hardness and the pH is from 5.9 to 6.9. If the pH is less than 5.9 and especially if the pH is less than 5.0, magnesium oxide is often blended in with the calcite. Depending on the water chemistry magnesium oxide is added at a ratio of 10% to 30%, to 90% to 70% crushed marble.
Calcite will raise the hardness level of water although often no water softener is needed, because the increase in hardness is minimal. Some waters are soft to begin with and after treatment with calcite will be moderately hard, but not hard enough to warrant a water softener. Since water chemistry and temperature vary, it is hard to predict exactly how much harder the water will become, but most users find they do not need a water softener after installing a calcite neutralizer filter.
About the Author
Gerry Bulfin is a licensed water treatment contractor and WQA Certified Water Specialist IV specializing in treating a variety of common well water problems including acidic water. He may be contacted through the website www.cleanwaterstore.com or by calling 831-462-8500 or by emailing him here.
Neutral Density Filters - Photography with Imre - Episode 11