Filter Backwash Recycling Rule Recordkeeping Form - Connecticut Department Of Public Health Page 2
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1
2Instructions
1.
Note the operating period for the information provided.
2.
The frequency at which the recycle stream is returned can be described as
continuous, once a day, or as another frequency.
3.
Fill out all information for each of your filters. If some or all filters are operated the
same, note the appropriate filter numbers.
2
4.
The backwash flow is obtained by multiplying filter surface are (in ft
by backwash
2
rate (gpm/ft
). Use the average backwash rate to get the average flow and the
maximum backwash rate to get the maximum flow. If the flow is varied throughout
the backwash process, then the average can be computed on a time-weighted basis
as follows:
(Backwash Rate 1 X Duration 1) + (Backwash Rate 2 X Duration 2) +...
Duration 1 + Duration 2 + …
5.
The filter run length time is the sum of the time that the filter is producing water
between backwashes.
6.
Describe how run length time is determined. For example, is the run length based
on head loss across the filter, turbidity levels of filter effluent, a predetermined
amount of time, or another method?
2
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