This is a fairly common problem, after using the toilet, you pull the toilet flush and it fills up in 30 minutes, instead of the usual 40 seconds. It can be quite annoying if a person wants to use the toilet after us, they find themselves without a flush to flush out their natural needs. This is a defect in the seal on the toilet float. This seal has been torn.
The Siamp rubber seal has been pierced, or has been torn, so you must change it making sure that it is compatible with your model of float. Make sure that the membrane seal of the Siamp float (the most common brand of float for toilets) is compatible with a high supply if your float has a water inlet from the top, or with a low supply if the water arrives from the bottom of the float. You can access this seal by first turning off the water supply to the toilet to make sure the water will not leak; then unscrewing a large plastic knob by turning it counterclockwise. There is no need to disassemble the float from the toilet bowl normally except if you have an older model float.
Some Internet users propose to repair this membrane seal by putting waterproof glue at the hole or tear and putting it all around the seal; then affix a thread made of cling film wound on itself and add a new layer of glue. The purpose of this repair is to get out of the planned obsolescence imposed by the presence of this thin rubber seal. However, this is a bad idea, as the gasket will still totally tear sooner or later and the risk is to have another problem: water constantly flowing leading to water damage. So it can only be a momentary repair while waiting to be able to buy the right seal. These days floats are economically priced and the gasket in question is worth a little less than half the float, which admittedly might seem a bit high for a piece of rubber. It can, however, be found in some stores at a cost of a third of the float's if you look well, but it will take time and gas in return.
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