Quote Originally Posted by BSHC View Post
I use an RV water pump that is piggybacked on a float switch inside the tank. When you buy a float swithc make sure it is for filling a tank. A sump pump float swithc works the other way to empty. I have it set up so once my head tank is down to 1/3rd full it automatically turns on the pump to fill from our outside storage. I just used garden hose for all the plumbing. I also put a check valve right near the pump so it does not have to prime every time it starts. If you have a bigger arch you would need better than garden hose but you should be fine with a 2x4. Just check the GPH at height of any pump you buy, often they have charts. Make sure its 25-50% more capacity than your max GPH evaporation.
Thanks for taking the time to respond. Appreciate it. Good tips.