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Hi Five days ago, my wife move the 3 fan tailed gold fishes from outside to a smaller indoor tank ( 1 ft by 1.5 ft x 1 ft deep)) because of the zero degree C freezing weather. they were ok last night but not eating a lot. Now one of 5 year old is not moving ( presumably death), the other two...

What is the best way and liquid spray to remove in situ the lumps of sandy deposit in between the fins of an aluminium Heat Exchanger of a fanned flue boiler. I tried sulphuric acid (brick cleaner), vinegar, methylated spirit on the samples to no avail The HE is difficult to come out...

My central heating is a conventional system with CH feed tank in the loft, a pump next to hot water tank, 3 way valve, a hall temp. rotary controller, a “Ideal Minimiser FF60 fanned flue” boiler which is now obsolete. The boiler starts with fan running, ignition on (sparking) then fire up...