just replaced my Hayward aql p 4 with a new GLXPCBMAIN. It only shows a T5 orT15 cell but our cell was replaced with a T3. Is the T3 compatible with the GLXPCBMAIN? It does not seem to be reading the salt content correctly. The board shows 2900ppm but the water report shows that our salt levels are off the chart at 4800. Help!