Current through Bulletin 2024-06, March 15, 2024
(1) The manager shall ensure that a filter
system:
(a) has a way to isolate each
individual filter for backwashing or other service; and
(b) is designed to allow the pool operator to
easily observe the discharged filter backwash water to determine if the filter
system is clean.
(2) The
manager shall ensure that a pool uses one of the following filters:
(a) a rapid rate sand filter;
(b) a high-rate sand filter;
(c) a precoat filter;
(d) a cartridge filter; or
(e) another filter type deemed equivalent by
the local health officer.
(3) The manager shall ensure that each filter
complies with the standard NSF/ANSI 50-2015, which is incorporated by
reference.
(4) The manager shall
ensure that a gravity and pressure rapid rate sand filter system is:
(a) designed for a filter media rate of three
gallons, or less, per minute per square foot of bed area at time of maximum
head loss;
(b) equipped with a
filter bed surface area that is sufficient to meet the design rate of flow
required by Section R392-302-19, Table 1, for
required turnover;
(c) equipped
with either an influent pressure gauge, vacuum gauge, or compound gauge, as
determined by the filter type, to show the condition of each filter;
(d) equipped with an air-relief valve at or
near the high point of the filter or piping system; and
(e) designed with necessary valves and piping
to allow:
(i) filtering of pool
water;
(ii) individual backwashing
of each filter:
(A) to a system as required in
Subsection R392-302-7(1)(d);
and
(B) at a minimum flow rate of
15 gallons per minute per square foot of filter area;
(iii) isolation of each individual
filter;
(iv) complete drainage of
the filtration system; and
(v)
convenient maintenance, operation, and inspection.
(5) The manager shall ensure that
a pressure rapid rate sand filter system is provided with an access opening of
at least a standard size 11 inch, by 15 inch manhole with a cover.
(6) The manager shall ensure that each
high-rate sand filter system is:
(a) designed
with:
(i) a minimum filter media rate of 13
gallons per minute per square foot of bed area; and
(ii) a maximum filter media rate of 18
gallons per minute per square foot of bed area;
(b) equipped with:
(i) a filter bed area sufficient to meet the
design flow rate required by Section
R392-302-19, Table 1, for
required turnover;
(ii) an influent
pressure gauge to show the condition of the filter; and
(iii) an air-relief valve at or near the high
point of the filter; and
(c) installed in compliance with the
manufacturer's recommendations for each system component.
(7) The local health officer may reduce the
minimum filter media rate as required in Subsection (5)(a)(i) to a rate as low
as ten gallons per minute per square foot of bed area where:
(a) more than one high-rate sand filter is
installed and operating;
(b) the
filter system includes a valve downstream of the filters that is designed to
regulate the backwash flow rate; and
(c) adequate backwash flow is maintained
through each filter according to the manufacturer's requirements.
(8) The manager shall ensure that
each precoat filter system is:
(a) designed
with:
(i) a filtering area that is compatible
with the design pump capacity as required by Subsection
R392-302-19(1)(m);
(ii) a filter media rate that:
(A) is a maximum of two gallons per minute
per square foot of effective filtering surface without continuous precoat media
feed; or
(B) is a maximum of 2-1/2
gallons per minute per square foot with continuous precoat media
feed;
(b)
equipped with a feeder device that feeds precoat media:
(i) accurate to within 10%;
(ii) continuously within a calibrated range
that is adjustable from two to six milligrams per liter; and
(iii) at the design capacity of the
circulation pump;
(c)
designed and constructed with materials that will withstand normal continuous
use without significant deformation or deterioration that could adversely
affect filter operations;
(d)
supplied with potable water delivered through an air gap as required in Section
R392-302-6;
(e) equipped with:
(i) an influent pressure gauge, vacuum gauge,
or a compound gauge to show the condition of the filter; and
(ii) an air-relief valve at or near the high
point of the filter or piping system; and
(f) designed to facilitate:
(i) cleaning by one or more of the following
methods:
(A) backwashing;
(B) air-bump-assist backwashing;
(C) automatic or manual water spray;
or
(D) agitation; and
(ii) complete and rapid draining
of the filter system.
(9) If fabric is used, the manager shall
ensure that filtration area is determined based on effective filtering
surfaces.
(10) The manager shall
ensure that:
(a) diatomaceous earth filter
backwash water is discharged as required in Subsection
R392-302-7(1)(d)
through a separation tank that has a sign that meets the requirements of a
two-inch safety sign described in Subsection
R392-302-32(1),
warning the user not to start up the filter pump without first opening the
air-relief valve; and
(b) personal
protective equipment suitable for preventing inhalation of diatomaceous earth
or other filter aid material is provided for pool operator
use;
(11) In vacuum
filter system installations where the circulating pump is rated at two
horsepower or higher, the manager shall ensure that an adjustable high vacuum
automatic shut-off device is provided to prevent damage to the pump.
(12) The local health officer may:
(a) exempt a pool from the requirement in
Subsection (3) for precoat filters if the precoat filter elements are easily
accessible for cleaning by hand hosing after each filter backwash
cycle;
(b) approve site-built or
custom-built vacuum precoat filters if the precoat filter elements are easily
accessible for cleaning by hand hosing after each filter backwash cycle if it
complies with the design requirements in Subsection (7); and
(c) approve any design that provides
equivalent cleaning of precoat filter elements.
(13) The manager shall ensure that each hose
bib is equipped with a vacuum breaker listed by the International Association
of Plumbing and Mechanical Officials, IAPMO, the American Society of Sanitary
Engineering, A.S.S.E., or other nationally recognized standard.
(14) The manager shall ensure that a
cartridge filter system is:
(a) designed and
constructed with:
(i) sufficient filter area
to meet the design pump capacity as required by Section
R392-302-19, Table 1;
(ii) a maximum filter media rate of 0.375
gallons per minute per square foot of effective filter area; and
(iii) materials that will withstand normal
continuous use without significant deformation or deterioration that could
adversely affect filter operations such as polyester fiber;
(b) equipped with
(i) an influent pressure gauge, vacuum gauge,
or compound gauge to show the condition of the filter; and
(ii) an air-relief valve at or near the high
point of the filter system; and
(c) cleaned in accordance with the
manufacturer's recommendations.
