when I log onto this home page the first thing I see is the HTH pool filter sand advertisement. This is fine, because I am trying to read all the info I can regarding types of aquarium sand for freshwater tanks. I have a 180 gal that I am setting up and I want to use sand as the substrate. I have read about alternatives to actual aquarium sand and this HTH pool sand has been mentioned positively quite often as a substitute. Does anyone have experience using this sand? I was thinking that because this ad was one of the first things I saw when I logged on that this HTH sand was a recommendation. Any comments?