Never this slow. Usually after a storm just shoot water in side scuppers and all clear. This time seems to be blocked as the bilge manifold empties into the torpedo tube towards port of center line. Anyone ever use drain cleaner(virgin sulfuric acid) to clear bilge manifold as it empties into the torpedo tube without damaging pvc pipe and 1978 plastic hose? I'm ready to take rubber boot off t/tube but ........ Thanks in advance for input.