I've Oil central heating. My tank is a plastic 1200 ltr ( semi circular type . Titan I think ) feeding a Firebird Popular 90 in the Garage The tanks the same age as the house I guess. 25 years. I have not been getting any problems at all, but just took an inclination last week to buy some water finding Paste. Smeared some on a stick and stuck it in and it show approx 1/2 inch water detected. Like I say, been having no problems, but what's the best way to get rid of this water. I know that you can get the sock type thingys that absorb the water but they only seem to absorb small amounts. Any advice would be appreciated