I bought my house last year and I'm completely lost about what we're doing. So we removed the cover and tried to turn on the filter. When we turn it on backwash and rinse we can see the water come out of the waste pipe. However if we turn it to filter, how can we tell if it's actually working. We don't see any ripples nothing in the pool. There is an air pressure gauge at the top of the filter (Hayward S200) but it's not changing. There are two valves, one has the option for "off" and "in" the other "off" and "inlet". There are two spigot type valves on the pump also, but these appear to be the return valves to the pool. There's a drain at the bottom of the pool to which we assume is used to drain the pool. How can we tell if it's working? Shouldn't we be seeing water going through the filter (clear dome)?