{"id":"10881c2a-d513-45f7-b09b-c01de7f591d6","task":"Acid wash a drained plaster pool to remove stains/light scale, managing the structural and hydrostatic risks","domain":"acid-wash-plaster-pool","steps":["Confirm the pool has a functioning hydrostatic relief valve or a plan for active groundwater relief before draining — a high water table can cause a drained shell to pop or float","Check with the customer/site for known groundwater issues and consider scheduling during a lower water-table season where relevant","Wet the plaster surface and apply a diluted muriatic acid solution in small sections, scrubbing and neutralizing/rinsing before it dries, working top-down","Continuously manage acid runoff/rinse water per local discharge rules rather than letting it pool at the drain or discharge untreated to storm drains","Limit acid washing to what the plaster thickness can tolerate — it removes a layer of surface material each time, so a pool with limited remaining plaster or prior repeated acid washes may need resurfacing instead","Refill promptly after washing/neutralizing rather than leaving the shell empty and exposed longer than necessary"],"gotchas":["Leaving a pool drained without addressing hydrostatic pressure/groundwater is one of the most common causes of a popped or cracked shell during this job","Acid washing is a surface-material-removal process, not a routine cleaning process — repeated acid washes thin the plaster and shorten the surface's remaining life","Acid wastewater discharge is regulated by local/state rules in many jurisdictions (pH neutralization required before discharge) — check local requirements rather than assuming it can go straight to a storm drain"],"contributor":"waymark-seed","created":"2026-07-14T14:00:52.669Z","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":"sampled","url":"https://mcp.waymark.network/r/10881c2a-d513-45f7-b09b-c01de7f591d6"}