Does anyone have an opinion on the quality of filter sand? My local chain discount pool store sells a 50 pound bag of filter sand for $6.00, for me it seems easier to just dump the sand and replace it every couple of years. that way I can check the laterals and all the connections and know that my filter is completely clean and working correctly. I find that I do not get much of a rise in pressure between backwashes but if I do not backwash at least every 2 weeks the water starts to look cloudy. I was just wondering if there are differences in the quality of filter sand you can buy. I know about Zeobrite and am thinking about switching to that next year.