I have a gunite pool with a spa. The pool is about 5 years old. When the pool was new, the water pressure coming from the spa jets was very strong. The spa would heat up in minutes. Over the last few years, the pressure from the jets became very weak. When the spa is turned on, you can't see a ripple on the spa water surface due to low pressure. The pressure increases if I run the air bower and then shut it off. 3 pool companies have no idea why this is happening. I'm thinking about swaping out my 2hp motor for a 3hp, but I don't think this is the problem. Anybody have any ideas?