How To Lower Alkalinity In Hot Tub Water. Keeping the ph of your hot tub at the appropriate level is a necessary part of spa maintenance. You can purchase products from a pool supply store to regulate the ph, but if you do not have these chemicals on hand or if you prefer a more natural approach, adding vinegar to your spa can safely lower.
If the alkalinity is not lowered… Once the water stops moving, leave the hot tub open for an hour for the hot tub water to breathe appropriately. Start up the hot tubs pumps;
Firstly, you need to calculate the actual amount of sodium bisulfate that is needed.
When you pull out the strip, it will change colors. Then add 100 gm, 4 capfuls of spa shock to the water to regain water transparency. Submerge the test strip several inches below the water. After adjusting the alkalinity level, if still, the water looks green adjust the sanitizer level.