Have been testing our pool for many years. Everything is in balance but the Chlorine Level. We have a Salt Water system.
PH 7.8
Alc. 125
CH 175
CYA 80

When I put the powder in the water (10M) to test for Chlorine it turns gray. I'm not sure why it won't turn pink at all. If I use a stick, it does show low chlorine, but can't tell how low. Should I put some Clorox in to give it a shock or put the SW system on shock to give it a boost? Thanks for any suggestions.