My family bought a new house in 2014 and it has a pool (first for us). The owners left everything with the pool including a Polaris 280 cleaner. Everything has worked fine until this year (as I am working to get the pool ready for warmer weather). We used everything as it was in the few months we had in 2014. In 2015, I changed the filter and main pump as I got a great deal on a 30" sand filter and a variable speed pump. The 280 worked fine for 2015.
Now in 2016, I discover the line from the booster pump to the pool wall is has a Tee under the pool deck and there are two outlets (one has been plugged since we purchased the home and the other is the fitting or the Polaris). When I hook up the polaris and turn on the booster pump, the plug in the second leg of the Tee is being blown out. There are no clogs in the polaris hose. I replaced the wall fitting and pressure release valve, to no affect. If I plug the second outlet with a 1.5" rubber (winterizing) plug, the water will flow from the primary cleaner fitting. Once I hook the polaris to it, it will run at most for 30sec - 1 min before blowing out the plug on the second outlet.
Looking to get input on options. I figure I could lower the water level and permanently plug the fitting, but I am worried if I am building up too much pressure. I notice that there is some leakage at the Polaris swivel fittings, so I have ordered a set to replace those.