You should not put Clorox in the pump which then goes in to the outside water, Bad for marine life. Also do not wash your deck with Bleach!!!
Never use bleach in a sump...it'll damage the rubber in the sump pump.
There are only a couple of uses for bleach on a a boat: 1. Annual recommissioning of the fresh water system (follow directions in the "sticky" post at the top of the Plumbing and Sanitation forum)...and 2. Wipe down hard surfaces in cabin to prevent or cure mold and mildew.
To clean sink drains and sumps: Raritan only markets their C.P. Cleans Potties as a bowl cleaner--and it is an excellent one. But it's a bio-active (live bacteria) product that also happens to be the best sump and drain cleaner on the planet and it's very easy to use...no manual labor required.
Sink drains: close the drain seacock and put an ounce or two of C.P. down the drain when it can stand at least overnight (the "bugs" need time to work)...fill the drain with water. In the morning open the drain seacock and run plenty of clean fresh water through it.
Sumps: fill the sump about 1/3 full with clean fresh water...add 2-3 oz of CP--again, when it can stand at least overnight. In the morning run plenty of clean water through the sump...job done.
Although C.P. needs at least 8 hours to work, it can remain in drains and sumps for weeks without harming anything, so if it's easier to clean sumps and/or drains last thing before leaving the boat for a week or longer, that's ok...the "bugs" exhaust themselves after 24 hours, but all you need to do when you return is run water through 'em to rinse 'em out.
--Peggie