Problem with an existing infinity pool catchment trough. Pool has been operating for 5 years without a problem. One day the catchment trough fills up and overflows. The pumps are turned off and I tried to recreate the symptoms, but all water drained to the deposit with no problem, although it did appear to be 'sucked' up rather than just by gravity. 2 days later same problem occurred - I know because I had switched off the auto-fill to the deposit and we lost about 1000L water. Tried to recreate the problem again but drained without a problem, although by 'gravity' rather than suction this time. Does this mean I have to have a reoccurring, temperamental blockage in the drain tube? Drain tube diameter 150mm or 6" - can't have can I?
Any thoughts as I am baffled?! I haven't actually seen the thing overflow either which makes me think the gremlins are out.
Thankyou - Guy