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1 Broken or failing parts inside the tank (like a fill valve, flapper, ball cock or tank lever) may cause a toilet to run continuously. 2  DIY replacement parts for this problem typically cost $5-$50 depending on the brand of toilet, with an average cost of less than $25. 3  This project might take 20-30 minutes or two hours.
There are 1000 liters in a cubic meter. If you have a water meter, to work out the cost per m3 add the cost of water per m3 (around Â£1) and the cost of sewage per m2 (around Â£1.5) give you your total cost per m3 (around Â£2.5). So a 6 liter toilet flush cost about 1.5 Pence.