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Filter sand

I own a residential/commercial pool   construction business in Ohio.

We have had issues on three different residential systems, where the

pool filter sand is "clumping" inside the pool filter. All three are the same:

less than 30 days into operation, hi

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Mycobacterium abscessus

Recently had an outbreak of Mycobacterium abscessus which was traced to a local YMCA pool.  This is a RWI I have not heard of, looking for any information on it I can find.  

So far I have found that a CT value is 3-10 times that of giardia and that i

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