GLB Calcium Hardness Up, 15 lb | 71251A Zinc Anodes Confirm your housing's standpipe diameter

Confirm your housing's standpipe diameter and the number of cartridges required before ordering — Pentair Module Media systems use multiple cartridges per housing depending on the configuration

Pentair (formerly American Products) American Valves 50123100 Spider gasket for 2 in

Replacing all four cartridges at the same time ensures consistent flow

Natural Chemistry PHOSfree MAX - 32 Oz Bottle

Pentair R141036 Rainbow #127 Thermometer

GLB Calcium Hardness Up, 15 lb | 71251A Zinc Anodes Confirm your housing's standpipe diameterUse calcium hardness up to increase water hardness levels, help prevent equipment and surface corrosion as well as minimize foaming. Features and Benefits: Calcium hardness levels should be maintained at 150 250 ppm One pound increases calcium hardness 10 ppm in 10,000 gallons of water Compatible with chlorine, bromine, mineral purification systems, salt water chlorine and ozone sanitizing systems