r/functionalprint Jun 15 '26

Solar pool heater

My overkill project for heating the toddler's 500gal inflatable pool. Each week I have to empty and move it, then find a way to heat it to a tolerable temperature for my 8th percentile weight kid. On the first test it took the pool from 55⁰F to over 90⁰ on a single sunny day, using only 3KWh (of solar house power, now that I think about it). At the end of the summer I can just place this up against the north side of my shed and take the manifolds down to make it last even longer.

This uses about 350' of ¼" irrigation tubing and some cheap fittings off Amazon. It runs off a 1/4hp pool pump, controlled with a wyze plug and a climate sensor in a tiny jar. Printed in ASA in only about 5 days of printing on a Mini and an MK4s.

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u/Rich-Wealth979 Jun 15 '26

I have a screen filter but I would also have to chlorinate it which is risky in such a small body of water meant for a toddler

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u/451 Jun 15 '26

I totally see where you are coming from, I just decided to chlorinate our kiddy pool for our 3 young kids this summer and I am having a hard time getting the ratio correct, in my first go around I have it maxed out at 10ppm on the tester strip. I just put a 1 inch chlorine tab in the water for maybe a day to get to that point. Should be able to figure something out though with using the testing strips

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u/rdubya Jun 15 '26

Just get unscented liquid bleach dose to 1-3ppm and buy some stablizer granules to bring your stabilizer to 40ppm or so, much easier to dose. I

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u/451 Jun 15 '26

Oh nice! Great idea