I installed the Pure Line 40000 gal system. Salt reading was high old system kept saying low salt so I put too much in until I realized the old system was not working. 

Had salt checked at pool center was 5100. I have drained about 3 ft from my 25000 gal pool 1 foot at a time.  Salt readings went to 4600 then to 4400 then up to 4800. Had water tested it at 4000 now is there a way to calibrate the system readings?

thanks for your help