For 15 years I have used nothing more than a $15.00 Kent Float Valve and Gravity.
I raised a 45 gal storage tank 2 feet off the floor and have my Sump with the float valve on the floor with 1/4 feed between them. Setting the float valve will determine and maintain the level of water in the sump. This gives me 3 or 4 weeks without refilling the storage tank.
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