I have a problem with excessive air in the filtration system that is causing problems when trying to vacuum the bottom of the pool. It can take up to 20 minutes for the air to be syphoned off through surface bubbles before the vacuum works efficiently.
I have a sand filter and water passes through it by using 4 valves. No' 1 and 4 are opened to use the vacuum. No' 2 and 4 are opened to filter the pool water, No's 3 and 4 are opened to top up the pool. Number 3 is opened to backwash.
In the top of the pump there is an inspection glass that shows the strainer basket content and this is invariably low on water causing the pump to seem to labour until sufficient water is in the strainer to enable the pump to work efficiently with a good flow of water passing through it.
Does anyone have any advise on how to get rid of the excessive air? I have checked the flexible vacuum hose for holes and can find none.
Regards to all