I own a flat in a Victorian building that has been converted into four flats. Two of the flats are empty (currently for sale) and a few weeks ago the owner of the basement (empty) flat said that he had had to call a plumber to unblock the communal drain as it was blocked with baby wipes. I told my tenants not to throw wipes down the loo - they said fine, I left it at that. Two weeks later, he says he called the plumber again, the drain was blocked with wipes. Again, I told my tenants not to throw wipes down the loo (they never said that they had in the first place), they said no problem. He has now called again today - 10 days later - saying the drain is blocked again, this time with cotton buds.
I just don't understand how a drain can get blocked this number of times - I mean surely my tenants, or the tenants in the flat below (all of whom seem quite sensible and haven't before caused a problem over the long time they've lived there), would have to be gleefully emptying cartons of wipes and cotton buds down the loo to cause this sort of problem. So my question is, could the blockage be coming from another property in the terrace of houses or could the plumber simply not be doing his job very well and not jetting away all the debris causing the blockage in the first place? This has now cost us leaseholders £450...