Filters SAND FILTERS     Sand Filters are the most commonly used filters for cleaning swimming pools, because of the ease of backwashing or cleaning the filter. They can filter out particles from 20 to 40 microns in size. The type of sand that is used is critical to the effectiveness of the filter.     We recommend that the sand be pool grade #20 silica sand which is .45 to .55mm in size. As water is pumped into the filter at the top, it is pushed down   through the sand bed. The sand particles trap the dirt and when the water   reaches the bottom manifold of the filter, it is clean and returned to the pool. SherLok It's Elemental     Easy Ring-lock access to filter element for easy servicing.  Built-in stops eliminate over-tightening.  No tools required.  Heavy Duty Filter Element is constructed of durable Dupont Reemay polyester cloth.  The coreless design allows easy cleaning from "inside-out" with a garden hose.  Our Patented Dirt catcher prevents debris from falling into tank when element is removed.  Safety tab lock assures proper installation and safe operation.  12 Year limited tank warranty.  Convenient 2" drain for easy draining and winterizing.  One-piece body with 2" threaded connections is injection-molded from corrosion resistant, glass-filled thermoplastic. D.E. Filter     Easy Ring Lock access to grind assembly for easy servicing.  Built-in stops eliminate over tightening.  The modular grid assembly with convenient strap handles allows easy one-piece removal for cleaning.  Our patented wiper plates can be moved up and down with the convenient T-handle to regenerate D.E. without disassembling the filter.  12 year limited warranty.  Convenient 2" drain for easy draining and winterizing with corrosion resistant glass filled thermo plastic.  Convenient, easy measurement D. E. scoop is included with each filter. Click Here to learn about Pristine Blue Aqua Genie Click Here