How To Lower Alkalinity In Hot Tub With Vinegar. To use vinegar to clean a hot tub, simply pour a one gallon jug of white vinegar into the tub and turn on the jets through one cycle. How to increase alkalinity in hot tub?
Vinegar is going to smell up the place, though, so be certain that you really want to do this. Using vinegar pour one gallon of white distilled vinegar into the hot tub or spa water. Even worse, chlorine loses its effectiveness around ph 7.8, becoming an oxidation agent that corrodes the metal in your hot tub instead of killing bacteria.
The best way to clean your hot tub is to drain your hot tub completely.
Vinegar is going to smell up the place, though, so be certain that you really want to do this. You can either use sodium bicarbonate (baking soda) or alkalinity increaser. Spray it liberally, let it sit for five minutes, and then wipe down the tub with a rag. This means you’ll have to use a lot more baking soda to raise the ph level, but the ta will be less affected.