I am purchasing my 1st AG pool (18x33). I am considering a Hayward 150 sq ft cartridge filter with a 1.5 hp pump or the same filter with a 1.5 hp 2 speed pump. I was told by an online pool company that the low speed setting on the pump wouldn't flow enough water to turn on a Hayward Aqua Trol RJ salt water chlorinator and to use the chlorinator, the pump would have to be set to high speed. Is there any truth to this?? Also, any feedback to whether this is a good setup for an 18x33 AG pool would be appreciated. Maybe 1 hp or a 100 sq ft filter vs the 150 sq ft / 1.5 hp 1 speed or 2 speed pump.