June 22, 20206 yr A problem fix for anyone with a Treatton water filter with a pressure tank. Problem: When you turn on the filtered water tap, the flow is initially normal then it decreases to a dribble. Fix: The tank should be at a pressure of up to 9 PSI. If you look on the bottom side of the tank there is a little air valve. Recharge the pressure to around 9 PSI. I drained out the tank first then pressurised it and now the system works fine again.
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