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I have the IC40 also. Not sure how to tell what version I have. However, it can be calibrated and I have looked at the circut board and it has the 3 resistors compared to the 1 resistor model. My issue is that the power light is a constant red. Also, when the unit starts, as it goes through...

I have them same issue with salt dropping. I have a 17k gal pebble tech bottom pool in southern California. I do have an auto filler and it trickles most of the day. However, our pool also has an attached jacuzzi which we use quite a bit. So with kids jumping in and out and steam from the...