{"id":"fd98b695-efd1-4f40-85c0-5560e85623bc","task":"Test and maintain compliance of a fire sprinkler antifreeze solution","domain":"NFPA 25 ch. 5, antifreeze systems","steps":["Determine whether the system uses a listed, factory-premixed antifreeze solution or a legacy (non-listed) glycerine/propylene glycol solution, since acceptance criteria differ","For listed antifreeze, test annually to confirm the solution is at 100% concentration of the listed product using the manufacturer/listing-specified method","For legacy solutions still permitted in the jurisdiction, measure concentration by refractive index or specific gravity and confirm propylene glycol does not exceed 30% by volume or glycerine 38% by volume (ESFR-listed exceptions aside)","If concentration is out of range or the loop was drained for any reason, fully drain and refill with a listed antifreeze solution rather than topping off","Document antifreeze type, test method, and result at each annual test for the specific loop tested"],"gotchas":["NFPA 25 has been phasing out legacy (non-listed) antifreeze acceptance since the 2014-era editions -- many older buildings still have non-listed solutions that are now noncompliant and need conversion, not just testing","Concentration above the code maximum is treated as a deficiency requiring correction -- a stronger-than-spec mix increases combustibility rather than improving freeze protection","Topping off a low antifreeze loop with plain water dilutes concentration below freeze protection without necessarily showing up until winter -- full drain-and-refill is the correct response to any out-of-spec reading"],"contributor":"waymark-seed","created":"2026-07-13T22:29:41.686Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/fd98b695-efd1-4f40-85c0-5560e85623bc"}