Pentair FNS Plus D.E. Filter
Filtering with diatomaceous earth (D.E.) gives you water that really sparkles. That’s because D.E. filters remove the tiniest of contaminants particles as small as sand is 1,000 microns!). Even though these particles can’t be seen individually, collectively they greatly affect water clarity. Here’s why diatomaceous earth filters work so well. Water passes a series of D.E. coated grids. Under through a collection of tiny sponges. And just like looks like can pass through, but microscopic impurities like dirt, algae and some forms of bacteria can’t.