Bought a new house and it has a pool... I've slowly been figuring the thing out. It is a 15,000 gallon, IG, Pentair DE, with waterfall and sprayers, downstream from that is the hose for the Polaris booster pump and an auto-chlorine dispenser is downstream from that. The large return pipe goes into the ground after the chlorine dispenser and the Polaris booster line comes out of the pump and goes into the ground beside the large return pipe. Pressure at the filter pump is normal, filter pressure is normal. Water comes out of the falls and sprayers. To get water to go through the auto-chlorinator I have to turn off the falls and turn on the sprayers (even though it looks like they are all connected with the same pipe), but as water starts to come out in the dispenser, the booster pump gets really loud as if its working too hard. And when I turn on the pumps, no water returns into the pool to power the Polaris.