Yes, you can just switch to bleach. Post a full set of current water testing results. To make your chlorine test read higher than 5 which is the limit on your kit, dilute your sample. Mix one part pool water and one part distilled water, test as usual, then multiply the result by 2. If that doesn't take it high enough, mix one part pool water and two parts distilled water and multiply results by 3, etc.
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