A couple of quick comments:
1. Get the refill kit; use the OTO in a small bottle or tube. The colors you'll be seeing aren't on the test block anyhow. When you order the K2006, order an OTO kit, too. They are useful, and cheaper for a quick test, than the K2006.
2. Keep your pH high; that will minimize the smell. Also, do test the water with the local OTO, BEFORE anyone swims. Notice whether there's much color change between the color 5 seconds after adding and mixing, and 1 minute later. If so, do NOT swim. The change indicates high chloramine levels that will be very irritating. Especially, do not let your son in the pool.
3. Tell us how long you've used bromine -- has it been since 2005? If so, you're probably going to need to plan a water change (NOT: drain -- you can't drain a vinyl pool) to remove the accumulated DMH.). But I need to check -- for all I know, it's possible that DMH can be biodegraded to ammonia in a manner analogous to what happens to cyanuric acid. If so, it may be gone. But, I don't know how to test for that.
4. You may want to look at this, about contact dermatitis due to DMH: http://www.postermedic.com/parcdesal...imas105237.pdf
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