I just replaced a super noisy single speed pump with a new 1.5hp Hayward SP2300VSP Variable-Speed Pump. It works beautifully. It can push water with no problems at very low speed. My issue is the chlorine level. I don't think I have enough pressure at low speed to get any chlorine out of my Pentair 320 off-line chlorinator. Is this a common issue? I hate to have to run the pump at high speeds just to get chlorine in the pool and not take advantage of the VSP. Any ideas would be awesome. Thanks.