Short answer?
I don't know!
What would I recommend?
1. Go to Walmart, buy a bottle of DISTILLED water (not: spring; filtered, bottled, etc, but DISTILLED). And if you don't have PLAIN bleach at home, buy a jug of PLAIN bleach.
2. Find a glass or porcelain container into which your test block can be submerged.
3. Mix tap water + bleach at a 3:1 ratio and fill, covering the test block.
4. Wait 5 minutes, remove, rinse under pressure, repeat (wait, rinse)
5. Rinse AGAIN with distilled. Empty, then leave distilled water IN the block for an hour or so.
6. Then (Whew!) test your pool and see what happens.
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