My wet/dry filters are 60 gallon tanks that are only 1/4 full of water. In power outages, they only get about 1/2 full so I'm not too concerned about an overload on the drain system. I like the idea of attaching a garden hose to the end of the drain and moving it around the yard. I will probably use 2" pipe for the main line and run 1" flex pvc to the tanks since it will be easier to work with. Since I have a small house, it really isn't a hassle to toss a siphon hose out the door into the yard. I forgot to mention that my house has a crawlspace underneath it and I have supported the joists with cinder blocks, lol. I hate crawling around down there so I'm gonna try my best to only have to go under once to run the drains and the fill lines. Going to the house water filter place today to check out what they have.