How do you adjust a Korky's anti-siphon's 528's tank water level?

Try adjusting the water level in the tank. Most flappers close as the water in the tank flows out to a certain level. Try allowing more water to come in to the tank. I doubt the weight of the chain has any effect on it closing too early.

After flushing the toilet, water still fills the tank till then the shuts off valve reaches a certain level. When the shuts off valve reach the level it disconnect the water connection to the tank and the filling process of the tank shuts off.

So, if your fill valve didn't shut off then maybe there's a problem with the shuts off valve, open the fill valve and fix it. If you can't fix it call a plumber for it.

mike I guess your toilet must be ok by now since your sept posting.GL

either the fill valve is running and water is draining into the bowl via the overflow tube in the tank or the flapper is bad (or foreign matter) and it is allowing water to escape into the bowl slowly...causing the fill valve to run every few minutes or so. hope this helps but if you need anything else just text me here:)

You are going to have to adjust the valve you just installed. Most can be adjusted by pulling a ring close to the bottom upward and pulling the neck of the valve up, in turn adjusting the water level in the tank. There should be instructions in the box on how to raise the water level.

If the water is reaching the tank overflow tube, the float valve is not stopping it fully. If the valve is new or not too old and you have instructions or know how to disassemble it, you can flush it to ensure there is no debris in the valve or on the seat. Although the manufacturers recommend this, I have never found anything on the seat.
If you can't do this, a new float valve assembly must be installed.
Gary

Rossouw R. im a plumber.

Were the flexi hose go in to the toilet and conect up to velve thread tape. unscrew the flexi hose and then the plastick nut holding the velve on to the sistern.

put the new velve in and bobs ur uncel.

Its very easy, just look were the 2 seal rubbers are when u remove it, may be 1 rubber.

and the flout of the velve will be a cup or ball, thast ajast that tothe right water level, u will c were the flout or ball is on new velve there will be plastick with bumps un it [most commen] if not let me know bt around that area u should find somting to adjust the hight. sorry for spelling errors, im a plumber nt a english major lol

plz let me know if u get in a rut .that is realy the onley solution.

WATER LEVEL IS NOT PROPERLY ADJUSTED. REDUCE WATER LEVEL TO FILL LINE

These models need to have a flush valve flapper that has a styrofoam float on the lift chaninof the flapper. Go to hardware store or home improvement store and get a 'Korky brand toilet tank flapper with float 'ball". Cut the rubber ring piece away from the flapper and you don't need it (see cut here marks on flapper). Install flapper and adjust the float fairly close to the flapper.
When the water level drops in the tank and reaches the level of the float on the opne flapper, the flapper quickly closes causing the toilet to have a "surge" of siphon action which forces the water in the bowl to be drawn out.