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Have all swimmers exit the pool immediately, and close the
pool for 24 hours or a minimum of 3 to 4 complete turnovers.
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Remove the fecal matter from the pool, and dispose of the
fecal matter to a sanitary sewer.
-
Disinfect the pool vacuum or skimmer net used to remove the
fecal matter with a solution of 20 parts of water to 1 part 12%-15% sodium
hypochlorite.
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Gather representative samples of pool water for
bacteriological analysis. If using the membrane filtration technique
for testing total Coliforms, fewer than 1 colony per 100 milliliters should
develop over the 24 hour period. Currently, there are no rapid result
tests for Cryptosporidium protozoa.
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Raise the free chlorine level (or equivalent
sanitizer-oxidizer) in the pool to at least 20 ppm, and maintain the 20 ppm
level for at least nine hours in order to achieve a 10,000 CT value, an ORP
levels in the range of 900 mV.
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You may choose to completely drain the water from small
volume wading pools and spas with rapid (30 minute to 2 hour) turnover
periods, after the fourth turnover. All interior pool surfaces must be
disinfected with a 20 parts of water to 1 part 12%-15% sodium hypochlorite
solution.
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After 3 to 4 turnovers, backwash sand filters, or
disassemble and clean diatomaceous earth or cartridge filters according to
manufacturers recommended procedures. Disinfect the filter media or
elements with a solution of 20 parts of water to 1 part of 10%-15% sodium
hypochlorite prior to reopening the pool.
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Do not allow swimmer back into the pool until tests show the
water is free from contamination.
