3131B High-Rate Sand Filters — 2025 California Building Code
California Building Code (Title 24, Part 2) · 2025 edition · updated 2026-10-19 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Building Code (Title 24, Part 2) § 3131B · Effective January 1, 2026 · Official source: Building Standards Commission
In addition to the requirements for all filters as indicated in Section 3128B, the following apply to high rate sand filters.
3131B.1 Flow rates.¶
Maximum and minimum flow rates for backwash and filtration shall be maintained according to the applicable requirements established by the NSF/ANSI 50-2010 performance standard effective August 2010.
3131B.2 The filter media shall have an effective particle size between 0.40 and 0.55 mm…¶
3131B.3 The backwash rate for a high rate sand filter shall be a minimum of 15 gallons…¶
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