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My sister has a two year old Jacuzzi toilet that worked fine until a few months ago. Then it started to take 10 minutes to shut off after each flush. I lifted the tank cover and immediately saw the problem; at least 90% of the refill water was going into the refill pipe instead of the tank. Upon examination I discovered that the plastic part that holds the flexible refill tube to the vertical refill pipe was broken. This part not only holds the refill tube in place, it also has a small orifice at the end to restrict the flow into the pipe. The part was broken in such a way as to let nearly all the water go into the refill pipe instead of the tank, hence it would run for 10 minutes after the toilet bowl was full and waste all that water. I found a small coarse thread stainless steel screw that fit into the plastic attachment piece to help plug the orifice and cut down the amount of water going to the refill pipe. Now the toilet flushes and refills in less than 2 minutes. I'm in the process of trying to find a replacement for that part but so far no luck.
Vent pipe may need cleaning out, vent stops up your system has to get air to work so it will take it from where it can get it and the toilet maybe the easied place.
You may have a vent pipe that may be partly blocked or clogged up. To check a vent pipe out you can have someone fill a sink or tub up to the flood level rim and plug the drain. Have them remove the stopper and watch the toliet you have had issues wit to see any water movement. Once you deteemine which one is the cause you can snake the vent pipe or run a water hose down the vent and turn it on to flush out the vent pipe.
The water level in the bowl is determined by the built in trap in the back of the bowl. Water is allowed to enter the toilet and it then "over flows" the p trap in the back when flushed. Once it's flowing, it syphons the water out of the bowl. While the tank is re-filling, a small portion of water should be running down the overflow from the small hose clamped onto the overflow This rinses the inside of the bowl, as well as helps-refill the bowl. Be sure that hose is directed inside the overflow tube. To see what the max water level in the bowl can be, add some water from a cup or glass. Once it's full you can keep adding and it won't get any higher. This will be the max level you can expect.
The only adjustment available is to control how full the tank will be for the next flush. The water that runs down into the bowl after flushing comes through the same valve that fills the tank, so the problem (and solution) is entirely with the amount of water that runs into the bowl while the tank is filling. The tank is filling sooner than enough replacement water can run into the bowl. Make sure that the tube (usually a 1/2 inch rubber tube) that runs from the float valve to the pipe that fills the bowl (usually a 1 inch pipe with an open top) is actually delivering all of it's flow down that pipe. If the flow of water being delivered by that tube is slow, you will have to find and eliminate the restriction. You might be able to pull of the rubbber tube off of the float valve and stick a small drill bit (just using your fingers, not a drill) into the fitting where you pulled off the tube.
for the upstairs if the valve is fully on there is not much you can do other than replace water service to the house or heaven forbid repipe.Valves usually don't restrict fill volume.But you can take the supply loose from the tank and stick it in a bucket turn the valve on and check the flow.this should narrow it down.Down stairs repair or replace flush valve
If this is a new development, then you have a partially clogged drain or maybe a crack in the bowl assembly. If the toilet always did this, then perhaps the drain pipe was not installed correctly.
I would remove the toilet and run a snake through to the main stack. If you find that is clear, check the bowl for cracks and check the tank water level to be sure that the tank is filling to the water line on the tank