An auto fill system is best installed when building a pool because the water line can be buried and out of the way. I had to do it after pool construction two years ago, and I found a way to run a line which would not interfere with anything. Be sure to use a uv resistant clear plastic line, 3/8" inside diameter which will not deteriorate in the sun. There is a Texas firm on the internet that sells it. Use good brass connectors. I installed a plastic box type unit from Pool Sentry. It was about $70. I have had no problems with it jamming. I do not notice any significant water usage increase. Because I am away a lot, evaporation was a problem. Problem solved.
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