Check the listing for details. 20" Standard LimeScale Reducing Water Filter Cartridge 2.5" x 20" Slow Phos/GAC. Condition: New. Listed at 50.00 USD. OCEANIC WATER SYSTEMS661 575 0033OCEANICWATER . COM MODEL # : PHG-2520NG GREAT SCALE, TASTE AND ODOR REDUCTION FILTER DROP IN STANDARD BLUE CARTRIDGE 2.5" x 20"This 2.5" x 20" premium Carbon + SLOW PHOS (phosphate beads) refillable filter uses high grade filtration media for chlorine, taste, and odor treatment.This mix of coconut shell carbon (GAC) and phosphate is most often used for scale prevention, corrosion inhibition, and iron control.This filter fits any standard housing made for 2.5" x 20" cartridges. Save money with this refillable inline filter.Carbon (GAC) Water Filter Replacement Cartridge with PolyphosphateGAC filtrationPolyphosphate filled to prevent scale accumulationProtects plumbing system metals from acid water corrosionChange every 4 - 6 monthsSignificantly extends the life of all water using appliances from the adverse impact of acidic and hard water conditionsTypical lifecycle - 95,000 gal. Oceanic Carbon Lime/Scale reduction Drop in WATER Cartridge Filter USA 2.5" x 20" Made in USACarbon (GAC) Water Filter Replacement Cartridge with PolyphospateGAC filtrationPolyphosphate filled to prevent scale accumulationProtects plumbing system metals from acid water corrosionChange every 4 - 6 monthsSignificantly extends the life of all water using appliances from the adverse impact of acidic and hard water conditionsThe filter cartridge is half filled with polyphosphate spheres which provide the essential protection to both tankless and traditional hot water tank systems. This ingredient reacts with naturally occurring calcium bicarbonates in the water supply to form a thin, tight, non-corrosive, passivating film on pipe walls. This film is almost like a glass coating, separating the water from the metal plumbing / hot water system.If you are any part of the country with hard water, which happens to be most of us, you have the potential of creating scale in any piece of equipment that heats or boils water. This is because the same dissolved chemicals that cause hard water also cause scale buildup. But the same chemicals also cause water spots on your glassware, white residue build-up in your water faucets & shower heads, and in some cases - tough to remove stains in your porcelain bathroom fixtures. It doesn't matter if you are a restaurant owner trying to manage your company's image or a homeowner trying to extend the life of your coffee pot, if you have a hard water problem it's usually in your best interest to install one or more scale reduction filters. And often you can combine a scale reduction filter and a chlorine reduction filter in one package. But pay special attention to the change frequency if you do this. Scale reduction filters are rated in grains of hardness and often the scale reduction ability of your filter will drop off before you start tasting chlorine in the water. In other words, change your scale reduction filter on the schedule recommended by the manufacturer and not by taste for continued protection against scale buildup.Fits All Standard 20" Slim Blue Whole House Water Filtration Systems Track Page Views With Auctiva's FREE Counter