I got one. I have an 100gal tank, I hate going to the fish store. I got an Pure-Flo II Premium TFC reverse osmosis water purification system. 189.00$ It will make 24 gal a day.Thats in a 24 hr. day About a gal. an hour... I have a 55 gal rubermaid trash can with lid!!! Keeps the water claen, I drilled a hole in the top just big enought for the line.Keep it on my back proch, that way the bad water thats runs, off waters my flowers in the yard and the sun hepls heats the water. I like not running to the store. This pull everything out of the water to have to put back in ph. And I put the Kent Marine-C. I use Red Sea Salt It also puts back alot of minerals. My tank is only 8mos. old BUT knock on wood I have not lost anything I have put in yet. They say the filters last 1000 gal. 29.00 to re-place them. This pricing is here in Texas. but I love it. Worth every penny