In the month that I've lived in my flat, I've had persistent problems with a blocked shower drain.
I initially used Mr Muscle Drain Unblocker which worked for a few days (probably 30 minutes of shower time). The slow drainage returned and I unblocked again with the same product. On both occasions, I left the unblocker overnight.
A few days later it returned and it used the Domestos version and left it overnight. This had no effect. Drainage was still very very slow.
The other day I bought a cannister of PowerPlumber which worked for a while but the problem soon returned.
Can anyone suggest anything to help? What could the problem be?
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