I woudl like to add a waterfall to my existing 15x30 pool avg depth of 4' with 1.5" PVC for skimmer, bottom skimmer and the side feed for a vaccum. There are three returns all T'd off a 1.5". I happen to have a 3.4hp variable speed high head Intek pump and I have moved equipement about 40'. I ran the additional lines using 1 1/2 to 2" fittigns and then ran 2". So I would like to add a 3' wide sheer waterfall that is about 4' high. I added a separate 2" feed for the waterfall back to filter area. I calcualted head pressure of 23 for waterfall. I know the pump can easily handle this, in fact the specs say that at 23' of head it can put out 190GPM on 3500rpms. It is a High Head High efficency pump.
Can I feed the waterfall and pool outputs off this pump? If so how many SF does my filter have to be? I was thinking 200sf woudl be reaosnable.I really like cartridge filters. If the filter cannot handle this much output or for soemthing more affordable, can I add a bypass valve after the pump but before the filter and then divert some of the unfiltered water just to feed the waterfall and let the rest go into filter? If thi sis the case I was thinking I can get away with a 125SF filter. I really woudl liek to use this pump as it was given to me as a trade.