I have a chiller, but am trying something different this year. I have a 25' coil of 1/4" RO line coiled up in my sump and am running tap water through it. It is a very small amount of water actually, just a small stream barely more than a fast trickle. I'm sure my RO/DI filter system wastes more water than this.
Tried it yesterday for the first time at 6 PM (tank water got up to 80F) and ran it until 7 PM. Tank water dropped 0.5 to 79.5F in that one hour. Incoming tap water is 60F while the output after coiling through the sump was 70F. After I shut it off, the tank water went up again a few decimal points before dropping through the night. This is for a 230g system.
I'll try it again later this afternoon, when my tank gets warm again.
I have a solenoid water switch (same as I use for my ATO) that I could hook up to my Apex and use the temp control to turn the water on an off as needed. Will see how it works manually for a few days first though.
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