OK, I have tested my water, maybe monthly and it usually tested good other than needing more chlorine.
That's why I never emptied the spa. I thought that I must have great water since it usually seemed to be
within the good ranges with minimal adjustments. Today, everything was a little off so I thought it would be
a good day to dump the old stuff.
I also checked the water from my tap. It had no chlorine or bromine (a good thing I think), was neutral in the
pH area, alkalinity about 80 and hardness 100.
I have been cleaning my filters with a store bought cleaner (glad to hear that TSP will work also). Wondering about
the high density (I think that's what they called them) filters that I've read about. And if I'm cleaning them regularly
how often do they need to be replaced?