Long post but will give as much as I can (previous post got lost somewhere)...
History I had a problem of flooding in the bathroom, water in kitchen below, after turning on the water supply (had tried fitting new monobloc mixer in kitchen). The wash basin was full to the overflow (wasn't overflowing the wash basin). and the water was dirty and full of bits. This was possibly because the waste pipe was blocked. I am pretty (95%) sure that the wash basin tap (mixer) wasn't open when I turned the water supply on. I turned the supply off again and got the plunger out and unblocked the sink/waste pipe. I added some sin/drain blocker liquid. This appeared to rectify the issue and the water now goes down the plug hole easily.
Now, I believe that the water running into the bathroom had come from the one cast hole(s). I understand that this is probably caused by a crack in the basin and therefore the basin needs replacing.
My question... There is a drip from the cast hole now, but I am unsure why. It's extremely slow (a cupful every 24 hours I guess). It drips when the tap is closed (no water going into the basin). The flexi hoses to the tap behind the pedestal and all other fittings there appear to be dry.
Is there anyone that could explain this to me and where the water in the cavity (and causing the drip) can be coming from?
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