Greetings. i have a flushmate model #14-101526f in an amercian standard toilet..When pushing the handle down it goes down very slowly. Have to use a bucket of water to get it down. I tried plunging..thinking possible blockage. It didn't help. Plus water shoots out of the toilet/tank lid..I believe the water is coming from the discharge extension w/drain....

Any ideas what this could be???? Solutions??

thxs