CS can cause a greying of the tub. You might consider CC instead, it does not deposit black, but rather a light aqua blue.
It should not take a lot, but it is important to burn out the organics, and H2O2 or ozone would be great for that. Marshall Jeanne Shuford wrote: > AM HAVING A NEW HOT TUB DELIVERED TOMORROW. HOW MUCH CS WOULD IT TAKE > TO KEEP IT PURE AND CLEAN? HAS ANY ONE WITH A HOT TUB GOT THE > COMBINATION? WOULD APPRECIATE YOUR INPUT. JEN
