Good stuff. But i would look at the hurcon pumps again as i know that they are the most efficient far more so than a Onga badged job. we sort of worked on 5 years life for an onga and 10 for a hurcon, i have never swapped a hurcon out under warranty i have certainly swapped plenty of davy and ongers out. for example a 3/4 TX flows more than a 1HP CTX. and Ongers have no head so the cnr in your pipe work and there flow drops to next to nothing.
but the trick with sizing pumps is to look at there flow and pressure. a 3/4 HP TX hurcon will flow the same and have a slightly higher presser than a 1hp onga. Now depends on where you go most people will steer you to the Onga because there mark up is better and only look at the TX range all the rest are down specked.
what is your solar system, and how are you pluming it up. is it sperate to the filter system or all part of the same? and do you really need 3/4 for that? sounds like a second story set up with that much power?
Lastly a good sand filter will actually use less water than a cartridge filter if used correctly. but then size can be a factor.
look at some surface sealer, its like a liquid but it floats on top of the pool water and reduces evaporation. its not cheep but it works well, just cant use it if you have a wet deck.
doint get the 7t, trust me you want the 11T, there are times when you have to bump things up a bit and when your salt gets a bit low etc.
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