I purchased a 30' x 30" cover and it fits my well's Big Blue water filtration system perfectly. The filter block is 24" x 24 ". and has a depth of about 6 inches. I insulated all other piping and installed 3 x 250 watt heat lamps in large reflective housings (brood lamps). I switched the lamps on in a thermostatic socket (turns on at 35 degrees, turns off at 41.) So far, it's good.
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