The cement will be used for its ability to surround both the copper pipe and the fluid transfer poly tubing , In full the cement will be used as a full contact thermal bridge *and* as the thermal mass to store the cold.
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The pump is rated for a 30 inch head , I will only require about about 8 inches of head ,
Using gravity to my advantage the water will enter from a high point and exit from a low point , causing a slight siphon effect that will reduce the work load of the pump.
I have faith the siphon effect I mentioned will allow the Aqua lifter pump as its called to circulate the water at a constant low rate.
Being the pump is external it is easily swapped out for a larger pump
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