We keep a chlorine pool tablet in a double zip lock bag aboard our boat. To kill off the little growies in our raw water
hoses, and eliminate odors, once in a while I will carve off a very small piece of the pool tab and drop it in the raw-water strainer. It seems to work pretty well but it is tough on seals
and the strainer mesh itself so we don't do it very often. As an alternative, more recently I have been using a product known as "Salt-Away". Just adding the liquid allows it to pass through your system too quickly but if you soak a small piece of porus spong in it and put that in the strainer, it will leach out over a period of time and seems to work pretty well too. (Don't forget to remove the piece of spong!)
I recently had to do some work on our A/C system and in the course of doing so, back flushed the system with a garden hose after running some Salt-Away into it and letting that sit over night. I was amazed at the amount of junk that washed out. I intend to add two small Y valves to our input and output lines so that back-flushing can be accomplished without disassembling the entire A/C plumbing
system in the future.
FWIW! Good Luck...