My water was a little soft at 150 so i popped it up to 220 - but the pool supply place (actually a really great honest place i found) said i didnt need to buy anything because it would go up on its own. 150 seemed a long way from the 300 target and i could only get 8lbs of hardener anyway since thats all they had on hand. what would cause water to soften naturally and/or chemically? will it go up on its own? i guess my next step is to test my tap water - but if theres anything else that could contribute to it being TOO soft, i'd like to know.