I'm still new to pool maintenance. Wow, Thank Goodness for this site and the forum - and Thank You to all you pros for sharing your wealth of knowledge!!!!!! I have a CH level of 33. It is a plaster pool, but was recently painted and coated with something that is very slippery. I need to increase the hardness (obviously with a level of 33) - but don't have $100 to spend at the pool store. It's early August and none of the hardware stores have any de-icer in stock. Any other suggestions how I can increase this without breaking the bank?