Update on 3" puck to SWG's - (So far): First, thank you all for your suggestions (I also called the SWG company tech support - they believe the SWG's are functioning as intended, based on no alarms and a higher amperage draw on the display. They also said the swg'S are "sensitive"). It has been the biggest, most expensive mistake that I have made by converting to two SWG's (so far this year)! I was able to get the pool sparkling clean, chems test good with my taylor reagents, etc, but NO chlorine (with 2 rj60+ SWG's). Circupool is adamant that it is phosphates - it may be, who knows. I did order a phosphate test kit, but in the mean time I went back to my hayward offline chlorinators. I am totally frustrated with the conversion to salt water, and I personally am sorry that I spent the money on contraptions that will not work for me (even though I super sized them)! So now I have these useless contraptions, AND I just ordered a 50 lb bucket of chlorine tablets - MORE EXPENSE! If you are thinking of converting, my opinion is DON'T! I have had this pool since the mid 1980's and NEVER had this much trouble opening this pool! I will update again.