I bought this swg for my Intex 18x48 pool with a 4000gpm Hayward pump which is the max they say the unit is good for. My problem is my chlorine level dwindles over a few days to the point I keep getting algae (FC was 2ppm last night). I tried the unit with cya levels from 30-60 and still keep having problems. Salt levels are 3200ppm. When ever I get the algae I SLAM the pool and start over by increasing the run time from the recommended 4 hours to now 9 hours of run time and it doesnt help. Does anyone else have this problem. Does anyone know if reducing the water flow (maybe install a valved/chokeable bypass) to slow the water down through the unit might help? I never had this problem with the older style Intex SWG.