Have been set up for close to 3 months. All of a sudden having issues with salinity levels dropping consistently over 12 hour period. From 53 to 47 in one 12 hour period. Re calibrate and it works for another 6-8 hrs. Then back to the same issue. I have double checked with hand held CALIBRATED salinity tester and it reads 53.5!
After calibration I recheck by placing in 50 cal solution and it reads 50!
Please help!