My toilet is contstantly running?

I have a similar problem - I suggest trying:
Turn the main house stopcock fully on
Wash the internal fittings in dishwasher when problem occurs
Always keep a "toilet blue block in place"
Add a dash of washing up liquid in cylinder every so often
Renew any plastic/rubber seals
The problem could be dirt (or bacteria if using rainwater) on the seal ring located low inside cylinder

best wishes Nyge C
March 2011

But do not worry if you get it wrong - nobody will come to your house to inspect the fill level - and the regulations plumber speaks of apply only in the UK.

Peccavi
February 2011

on the cistern there should be a marking line this gives you a 6 ltr flush which is the right amount you need to flush thats in the water regs not an inch below the overflow

plumber1722
February 2011

They often have a little nylon adjusting screw on the arm close to the inlet valve - it shuts off the water - screw it in towards the valve & do up the locknut.

Flush several times & watch the action - keep adjusting until you get the water level about half an inch below that of the overflow pipe.

Peccavi
February 2011