In a few days I will need to clean/rinse out our current 1000 gallon sodium hypochlorite tank. The plan laid out by risk management is cut the tank in half and use the bottom as a backup catch basin for 2 smaller tanks that will sit inside of it.
So far the plan is to use a transfer pump to remove the 200 gallons that currently remain in the tank and store them in another container until later. This should leave only a small amount in the bottom. Right now I'm thinking that I will dilute it with water and then transfer that to the pool, rinsing and pumping it into the pool a few times until it's clean. Even if 10 gallons of sodium hypo remain in the bottom, that would only increase FC by roughly 2 ppm.
Is there anything I'm missing? Will there be fumes when I add rinse water to the tank? Will neutralizing it as I rinse help anything as far as fumes and safety are concerned?
It's been difficult to get information online about this kind of project. The local water authority just wants the tank rinsed out thoroughly, but I don't know how knowledgeable they are on sodium hypo.
Thanks a ton for any information anyone can offer.