What is DE?

[CarlD]

Yeah, we've had some discussion on it and it's a really, really BAD idea. Apparently the DE clogs the filter permanently....

But I also gather that the fibrous alternative to DE works very nicely in cartridge filters. Maybe something about the fibrous stuff being similar to fibrous paper in the cart?

[waterbear]

Pentair recommends adding DE ONCE to a new cartridge to increase filtering ablilty. I haven't done it but I mght consider it next time I buy a new cart to see if it has any impact on filtering ability or cartridge life.