Current through Rules and Regulations filed through September 23, 2024
(1)
Design. Filters shall be designed and maintained so as to provide
the water clarity noted in DPH Rule
511-3-5-.07(1)(e).
(a) Filters shall be listed per NSF Standard
50 with the specific maximum flow rates per surface area based on media
used.
(b) The following filtration
rates for the specific media shall be used in determining the filter area
required for the circulation system:
1.
High-rate granular media filters shall be designed to operate at no more than
fifteen gallons per minute per square foot when a minimum bed depth of fifteen
inches is provided per manufacturer. When a bed depth is less than fifteen
inches, filters shall be designed to operate at no more than twelve gallons per
minute per square foot.
2. The
design filtration rate for surface-type cartridge filters shall not exceed
three-tenths gallons per minute per square foot. One complete set of spare
cartridges shall be maintained on site in a clean and dry condition.
3. The design filtration rate for pre-coat
filters shall be based on the following types:
(i) Vacuum pre-coat filters shall not be more
than either two gallons per minute per square foot, or two and one half gallons
per minute per square foot when used with a continuous pre-coat media
feed.
(ii) Pressure pre-coat
filters shall not be more than two gallons per minute per square foot of
effective filter surface area.
(iii) The filtration surface area shall be
based on the outside surface area of the media with the manufacturer's
recommended thickness of pre-coat media and consistent with their NSF Standard
50 listing and labeling.
(c) Filters shall be designed so that
filtration surfaces can be inspected and serviced.
(d) Alternate types of filter media shall be
listed and labeled to NSF Standard 50.
(2)
Internal Pressure. On
pressure-type filters, a means shall be provided to permit the release of
internal pressure.
(a) Any filter
incorporating an automatic internal air release as its principal means of air
release shall have lids which provide a slow and safe release of pressure as a
part of its design.
(b) Any
separation tank used in conjunction with any filter tank shall have a manual
means of air release or a lid which provides a slow and safe release of
pressure as it is opened as a part of its design.
(c) Influent and effluent pressure gauges (if
both are present in the system) shall have the capability to measure up to
twenty pounds per square inch increase in the differential pressure across the
filter bed in increments of one pound per square inch or less.
(3)
Instructions.
Pressure filters and separation tanks shall have operation and maintenance
instructions permanently installed on the filter or separation tank and shall
include a precautionary warning statement not to start up the system after
maintenance without first opening the air release and properly reassembling the
filter and separation tank. The statement shall be visible and noticeable
within the area of the air release.
(4)
Piping. Piping furnished
with the filter shall be of suitable material capable of withstanding one and
one-half times the working pressure. The suction piping shall not collapse when
there is a complete shutoff of flow on the suction side of the pump.
(5) A sight glass shall be installed on the
waste discharge line of pressure filters so that the progress of filter washing
can be observed.
(6) All piping
shall be marked with directional arrows as necessary to determine flow
direction. All piping in the equipment room shall be permanently identified by
its use and the pool and or aquatic feature it serves.
O.C.G.A. §§
31-2A-6, 31-12-8, 31-45-10.
