I have a200 gallon tank and when I change the water I use a siphon gravel vacuum to get the water out. Then I use the water hose and fill up two large coolers full of water to condition the chlorine from them. After that I pump the water from the coolers into the tank. Does anyone have a better system to skip the cooler step? I looked into the attachments for garden hoses that say they filter out chlorine and chemicals but in the fine print they all say "not tested for aquarium and fish use". Anyone have ideas?