I am going to use a Hayward 300 Lb sand filter which will then flow thru a cartridge filter. Zeobrite, Zeobest and Zeobest and Zeobest Ultra all seem to be far better than sand, But which one to use. The Ultra seems to cost an arm and a leg and I can't swim with out those. My question is, is there really that much of a difference. Would I be just as good going with the Zeobrite vs the more expensive Best or Ultra, or are there really big differences that justify the additional cost.

Also are there other products out there beside Zeo that are as good or better but less expensive. I read something about the Ultra where you pour salt in the filter to revitalize it??

And last, if my Hayward says it has a 300 lb capacity how much zeobrite do I use. The ads say that 1lb of their product is like 2 lbs of sand. Is that volume or filter capacity. Do I use 300 lbs of Zeo?? or just 150 because its lighter but the same volume as 300 lbs of sand? I'm so confused. Please advise, Thanks.

Aranon