Anyone know anything about these cartridge filters? As far as I can tell, they are manufactured by the same company that makes Pentair. What, if any, problems would I need to watch for, especially at this price? They also seem to be called Sparco Hydromatic or just Hydro.
http://www.poolsupplies.com/cgi-bin/Com ... /sale.html
http://www.poolsupplies.com/cgi-bin/Com ... /sale.html