Replacing the gasket at the bottom of the canister (cylinder) will most likely solve your problem. However, if it doesn't, you may have a leaking fill valve. Before doing anything, check the water level in the tank. If the level is very close to the top of the canister, this could indicate a leaking fill valve. A leaking fill valve will cause water to flow over the top of the canister. The fill valve is located on the side of the tank near the flush handle. You can either replace the entire fill valve mechanism, or you can just replace a small round rubber seal located near the top of the fill valve. There are YouTube videos on replacing the fill valve. One way to determine if the problem is caused by the gasket is to lift up the canister and clean the gasket and the seat below the gasket to see if this provides a temporary fix to the problem.
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