I have done many water change systems. You can make one with two cheap Maxi jet pumps. You can use two timers set to the same amount of time and put one in your sump and one in the new water. Stagger the timers a bit so they don't come on at the same time. I have since abandoned this because doing a water change takes little time with the way I do it and it's less room for error
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150 gallon reef mostly softies/lps. 50 gal sump with bubble magnus skimmer/ Led fuge light/refugium/ 1200 return and tunze powerheads. Dual pharoah main tank led.4 pump dosser.
550 gallon stingray tank water drip system
150 bowfront. 75 turtle tank, many others
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