[liverpol12]

My toilet down stairs when I flush bubbles come some time it come when without flashing .toilet not connect with anything

[speedball1]

my toilet down stairs when i flush bubbles come some time it come when without flashing .toilet not connect with anything

Your toilet's connected to everything, as are the rest of your fixtures.
Bubbles indicate a partial blockage downstream from it. Let me explain.
. You flush the john, The discharge picks up speed as it drains and bangs into the partial clog in the line and starts to rebound back pushing a bubble of air ahead of it. This is what you see in the first floor toilet. Then, because it's not completely blocked the discharge drains away before anything overflows. This can only get worse. The drainage line that services the toilet needs to be snaked out or if you're on a septic tank it should be checked to see if it needs to be pumped. Hope this helps and thank you for rating my reply. Tom