Need to use pump.. to pump thru all those cement/rubbish..

my condo last few month clogged... then management use the bomba hose + the tool that will push the water out.. like a pan with stick..

they use the hose aim at the hole + stick in the pan to push to water out... 3 min kautim.. no more stuck..

please dont use vacuum out/in.. as it useless.. it pressure cant do much..