Hi I am wanting to sterolize my tank after a lot of fish loss I have rock sand and pumps in it still im wanting to use bleach and I am finding it hard to get in uk I don't mind using a product from the US but if someone could help me out and point me in the right direction for a product in the uk to buy I would more then appreciate the help demestos original has sodium hypochlorite in it but I'm not too sure about any other harmful additives been in it would this also be safe on the silicone and plastic pumps since I'm clueless