After draining our in-ground spa (to pressure test for a possible leak), I noticed some white scaling on the tile surfaces. Although the deposits were easily removed with a ScotchBrite pad, the spa builder said that this was likely due to either too high of a salt level or a calcium issue. Since I had consistently kept calcium hardness at 375 ppm, I assume that I eliminated calcium imbalance as the culprit. That suggests, therefore, that the salt level has been too high.
Although I have tried to keep the salt level around 3,400 ppm, I must admit that the various readings (from both the SWG & the Taylor reagent test kit) seemed to vary widely on a day-to-day basis. Before that was obvious, I likely overreacted to a falling salt level & added more salt trying to stabilize the level at 3,400 ppm.
In order not to "over-salt" the water in the future, would it be advisable to maintain a lower salt level (say, 2,800 ppm)? I want to maintain a sufficient salt level for chlorine generation, yet avoid the issues stemming from too much salt.
I would truly appreciate your thoughts on this. Thank you kindly.