Typical filter sand is a round slick granule that filters by capturing suspended particles between the grains of sand. As the suspended particles build-up on the top 2-3 inches of sand, better filtration takes place. Sand media can remove particles down to about 40 microns in size. Zeolite, on the other hand, consists of a rough angular surface in additional to its micro-porous structure. As water flows through the Zeolite media, larger suspended particles are captured between the grains of Zeolite, as well as, on its rough surface. Zeolite filters down to 3-5 microns or about the same as a DE filter.
In addition to superior filtration, Zeolite provides longer filter run times than sand. Because of Zeolite's large amount of available surface area, the filter can run 4 to 6 times, and in some cases, longer before the filter pressure rises to the point where backwashing is required. This feature conserves water and reduces the use of chemicals to maintain water balance. Zeolite also reduces the amount of head pressure in the filter. Typically, the starting pressure with Zeoliteis 2-3 psi lower than with sand. This is due to Zeolite's micro-porous structure that allows water to flow through the granules, which reduces the amount of water resistence to lower the head pressure. This feature equates to lower electric consumption by allowing the filter motor to operate at a lower Hz, which reduces the kilowatt hours used. An additional feature of Zeolite is its ability to remove ammonia and chloramines from pool water.
My 26" sand filter required 350 lbs of sand. I only needed 175 lbs of Zeolite. I have an Iron rich water supply that comes from a south Texas well. I fill the pool from a hose with a 2 micron iron removing filter. I've also used Metal Out and Polyquat to aid in removing metals. My water has been crystal clear since startup in early March. I've backwashed one time since startup and pump runs 12 hours per day. In my opinion Zeolite is the way to go.
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