Hello Christine,
I'm not a plumber but I did have a very similar problem with a Potterton boiler in a flat I was renting. Whenever it rained, water would form a pool on top of the boiler, and if it was raining hard enough the water would start to drip down onto the microwave cooker and units...
Tony – Thanks for your comments – I reckon I’ll be ok handling Hydrochloric Acid as you suggest –
keep the place well ventilated – don’t breath the fumes - wear old clothing, gauntlets and goggles - children and pets well away. After pouring into the gully and leaving for at least 30mins I’ll...
The "outside" gully for my Bath/Shower & Bathroom Wash Basin is actually inside the garage that has been built onto the side of the house.
The gully overflowed recently when I emptied a full bath of water. When I investigated I found that the gully was almost totally blocked with a build-up...