it should either be boiled or treated with SSKI.
What about a few drops of bleach (I forget the scientific name of pool shock)?
Bleach is toxic in and of itself, while SSKI is perfectly safe, and has the added advantage of providing necessary iodine to your body.
Oh! And get a free and Total chlorine residual test kit of some sort. Test strips and color wheel, or something similar. Free reading of between 1.0 and 1.5 is good. Total, slightly higher.