a decent in-line can be had used for $100
Bladerunner's bomb tank is great, IF you live in a area with a high water table and you get permission to dig a huge hole
I have been using a 50' copper coil submerged in the basement floor sump (water stays 58-62F year round) as a "pre-cooler" for my chiller. Works well for about 3 hours before it arms up enough to turn on the chiller. Also takes a high pressure pump.
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