well, good news and bad news, the bad news is that the block would not fit(without serious mods), he is building me a custom block as we speak, the good news is that I have the Rainbow pump running, 1140 GPH at the pump and get this 3 gallons per minute at the return line, none of my other pumps EVER came close to that number, also, it is so quiet that I can barely tell its running, I highly recommend this pump, remember it is an inline pump and cannot be submerged. Just an educated guess that my system is at about 25psi, how sweet is that.
Jim
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