ok i am working on a push button water change system for my reef tank. it seem to be pretty straight forward in my head, but often get ahead of myself. the system involves two pumps, two momentary switches, 1/4" water line, and two electric Polypropylene Solenoid Valves.



one switch will be yellow and one will be red, red being the waste water and yellow being new SW. when red button is depressed the valve will open allowing pump one to drain sump into plumbing under house. then depressnig the yellow would open valve#2 allowing the SW storage tank to fill the sump with new SW.





I am still waiting on all pieces to arrive , so the build hasnt been completed as of yet. This is mainly to toss this idea around to see if i am missing anything. If you see room for improvment or an error in my thinking, please let me know. Thanks in advance. Bryan

Well, do you have enough water in your sump to do the percent of water change you want?
In other words, you might need to put the drain pump in the main display to be able to suck and pump out enough water. If you put it in the sump, you might run it dry before you pump out all of the water that you actually want to pump.

I actually thought about this while talking to a friend of mine, so we are going to play with the design this weekend and see where it goes. Thanks for the input though, that is exactly why i posted before the build. I want to face all possible issues before the install.

Depending on your setup, you can pull out the standpipe if you have one in your main display to drain out more water towards the bottom, or put a siphon in place to siphon it down, etc.