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Salt Free Hard Water Scale Control Filter

Salt Free Hard Water Scale Control Filter

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Dimensions: 5 in × 5 in × 12.5 in
Weight: 5 lb

Product Shipping Information

Please be aware that this item may take a few extra days to ship to allow for production and assembly. You will be notified by email of the tracking info and the day it ships.

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Filter Water Directs Salt-Free Hard Water Scale Filter Cartridges are non-refillable polyphosphate-dosing cartridges designed to sequester iron and hardness to prevent scaling and precipitation reactions in beverage and ice-making equipment. These cartridges filter the water while treating it for chlorine and calcium carbonate through the dosing of polyphosphate. They can also be used as anti-scalers for pre-R/O or distillation and water ionizers. These hard water descaling filters are constructed totally from FDA grade materials and media. 

Phosphate Dosing and Hard Water Mineral Sequestering

The bicarbonate and sulfate salts of divalent ions such as calcium and magnesium undergo a change in contact with heat.  Such is the case in boilers and hot water heaters.  Calcium and magnesium (hardness) scale forms, reducing heat transfer efficiency.  Hardness salts also react with soap to form soap curd and the familiar bathtub ring.  Iron undergoes similar reactions and can also react with organic extracts in coffee and other beverages resulting in off-taste.  Hardness salts can also precipitate upon concentration, such as in a R/O or distiller.  This causes fouling and hard water limescale build-up.

Soluble polyphosphate salts added to water at threshold levels of 3 - 5 ppm can effectively tie up (sequester) divalent ions, preventing reactions and hard scale formation.  This allows the equipment to stay cleaner and easier to maintain.  Some cloudiness and soft scale may occur due to the formation of hardness seed crystals.  This is easily removed. This hard water descaling filter cartridge contains a crystalline form of food-grade polyphosphate that dissolves very slowly, allowing only 3 - 5% of the total phosphate will enter the water stream over a 30-day period.  This is enough to put 5ppm of phosphates into 25000 gallons of feed water per month for 6 - 12 months. This makes the Salt Free Hard Water Scale Control Filter ideal for the following applications:

  • Ice Makers
  • Coffee Machines
  • Point-Of-Use Hot Water Dispensers
  • Water Ionizers
  • Humidifiers
  • Evaporative Water Coolers

Polyphosphate Corrosion Protection

In addition to the scale prevention properties of polyphosphates, these salts combine with the surface metal inside pipes to form a protective layer that can reduce corrosion.  This is particularly desirable in handling low TDS, aggressive waters or acidic feed streams. 

This cartridge combines 0.5 lb. of crystalline polyphosphate with 36 cubic inches of premium, dedusted 2050 mesh GAC.  This is an ideal combination for coffee and ice-makers or for pretreatment of small R/O's requiring dichlorination as well as anti-scaling.

This hard water filter kit comes complete with a durable 10” housing that has ¾” female nipples on each side. It includes a handy wall bracket and housing wrench for servicing the unit.

Product Specifications:


  • Post Filter 20-micron spun-bonded polypropylene
  • Max Flow Rate .05 GPM
  • Media (Combines slow dissolving polyphosphate and premium, dedusted 20x50 mesh GAC)
  • Height 12.5”
  • Weight 5 lbs
  • Diameter 5”
  • Life Span 2500 gallons
  • Ph Range 6-9