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37.111.1140    FILTRATION EQUIPMENT

(1) Filtration equipment shall be provided on all swimming pools and spas and shall be installed and maintained in accordance with the manufacturer's specifications.

(2) The filter system shall be designed with necessary valves and piping to permit:

(a) filtering to swimming pool or spa,

(b) isolation of individual filters for repair while other units are in service,

(c) complete drainage of all part of the system, and

(d) necessary maintenance, operation, and inspection in a convenient manner.

(3) Filters will be backwashed at least once per week at swimming pools and daily at public spas, with the exception of cartridge filters which are discussed in (5) of this rule.

(4) A rate of flow indicator shall be provided and installed in such manner as to show the recirculation rate of the pool or spa water. The indicator shall measure the rate of flow through the filtering system with an appropriate range readable in gallons per minute accurate within 10% actual flow.

(5) All cartridge type filters must be approved by the national sanitation foundation or shall be approved as equivalent thereto by the regulatory authority. A minimum of three filters must be provided for each pool or spa, one in use, one which has been cleaned and is ready for use, and one which is being cleaned.

(6) All sand-type filters, whether of the gravity or pressure type, and including high-rate filters, shall be approved by the national sanitation foundation or shall be approved as equivalent thereto by the regulatory authority.

(a) The filter system shall be provided with influent and effluent pressure indicators as are required to indicate the condition of the filters. The filter system shall be provided with an air relief device at or near the high point of the filter. A sight glass shall be provided on the back-wash discharge line.

(b) Each pressure type filter tank shall be provided with an access opening of not less than a standard 11 inch by 15 inch manhole and cover.

(c) Devices with reasonably accurate dosage control features shall be provided for adding coagulants ahead of the filters.

(7) All diatomaceous earth type filters, whether of the vacuum or pressure type, shall be approved by the national sanitation foundation or shall be approved as equivalent thereto by the regulatory authority.

(a) Filtration areas shall be determined on the basis of effective filtering surfaces as created by the septum supports with no allowances for areas of impaired filtration such as broad supports, folds, or portions which may bridge.

(b) The filter and all component parts shall be of such materials, design, and construction to withstand normal continuous use without significant deformation, deterioration, corrosion, or wear which could adversely affect filter operation.

(c) The filter shall be so designed and constructed, or provision made, to preclude the introduction of appreciable quantities of filter-aid into the pool or spa during precoating operations.

(d) The filters shall be designed and installed in such a manner that they may be easily disassembled with allowances made for adequate working space above and around the filter to allow the removal and replacement of any part and for proper maintenance.

History: Sec. 50-53-103, MCA; IMP, Sec. 50-53-107, MCA; NEW, 1985 MAR p. 782, Eff. 6/28/85; TRANS, from DHES, 2001 MAR p. 2425.

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