I just bought a house with a pool. Had no trouble using the pool cleaning etc. today I tried to work the spa something has gone badly wrong. I turned the pipe levers so I had from spa and to spa on. Then I turned the pump on. Nothing happened at the spa. I couldn't feel any water coming out of the jets. Then I heard a big water rushing sound and one of the pipes at the back of the sand filter had popped off and water was cascading all over the place. I put the pipe back and switched the settings back to the way they were before then turned on the pump and the same thing happened. What have I done wrong and have I broken it?