Water comes from bottom of tank when commode is flushed. I have a two piece toilet, upon flushing it water pours from in between the two joined parts-tank and commode.

SOURCE: Water comes from bottom of tank when commode is

Ok the toilets work is that the tank reservoir is where your fresh water....is stored....and the flush valve...(if you take the tank lid off you will see that the handle is either connected to a chain or uses a lever to lift something called a flapper....it is usually black but it can be gray..or blue...also there is a flash valve that is a long tube and a round bottom with a rubber gasket...that seals the flush water into the tank...reventing it from entering the bowl.......when you lift the handle water dumps from the tank...into a s-shape tunnel called a trap...(this is in place to prevent sewer gases from entering the house the water sits in the bottom of the trap acting as a seal against smells...gas...etc...from the sewer line....Now your tank is mounted to the bowl by (2 or 3) bolts that you can see and access from inside the tank...however the person doing this will have to also reach under the toilet where the tank mounts to the bowl and hold a pair of pliers or a crescent wrench on the nuts which hold the tank in place.....after these are removed...the tank will lift off of the bowl.(now obviously the water has to be shut off and be disconnected from the tank....when the tank is lifted ...a small amount of water may spill out ...but it is clean water...so no worries....since the tank and the bowl are made of porcelain they obviously would not seal just sitting on top of each other so the tank...has the bottom part of the flush assembly which is mounted to the tank by way of a large plastic nut extends out of the bottom opf the tank 2-3 inches......around this is another black or gray about 3-5 inches in diameter...and costs less than $5 at Home Depot.....change this out, reassemble and your back in business. Be advised that the flapper in the bottom of the tank...if you ever have to change it out and the tank gasket you are going to change out (after a long period of use or just time and deterioration)...leave black residue on your hands...if you handle them...but it is safe and easily washed off...it just may freak.. a layperson out....so one may want to use some gloves they can toss afterwards....Any other questions....and I can absolutely answer them in regards to toilets...as i have repaired and or replaced 2500 - 3000 in my 35 years in the apt/home maintenance industry.

I hope this helps.....thank you for rating my effort...and good luck....tha Fang.