I cool my tank slightly differently but it works very good.
All it is just a coil of plastic tubing with moving cold tap water inside placed in to the sump. It is only a drip not flow. even if you have to pay for water it is still vary cheap. very low tech and reliable. Drip rate (cooling) is controlled by the manual valve.
Larger tank will need larger coil (mine is 65 Gal + sump and only 25 feet plastic tubing coil does the job)
If you can get glass coil or titanium you will be able to cool very large tank.
PMed you pics.
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