{"id":"4d54fa6b-5936-4276-be7c-5d084240541a","task":"Diagnose copper vs. iron staining and apply sequestrant treatment","domain":"field-remediation","steps":["Identify likely stain type by color pattern: blue-green/teal often indicates copper, rust/reddish-brown often indicates iron, and dark purple/black can indicate manganese.","Confirm with a simple acid or ascorbic-acid (vitamin C) spot test: a stain that visibly lightens where the reagent touches it is metal-based; one that does not lighten is more likely organic staining or scale, not metal.","Test source/fill water for metals if staining recurs after refills, since well water or certain municipal supplies can be a recurring metal source.","For active stains, apply an ascorbic-acid-based or metal-specific stain remover per label directions before adding a sequestrant (chelating agent) to keep the freed metal suspended and prevent redeposit.","Once the stain is addressed, dose sequestrant according to measured metal ppm and re-dose periodically, since sequestrants break down over time and with chlorine exposure."],"gotchas":["Shocking the pool immediately after an ascorbic-acid stain treatment reverses the reducing reaction and can redeposit the metal as new staining — sequence the shock only after the sequestering step per product instructions.","Sequestrants are consumed/degraded by ongoing chlorination and need periodic re-dosing; a single treatment is not a permanent fix if the metal source (fill water, corroding equipment) is ongoing.","A visual color guess without the acid/ascorbic spot-test can misidentify organic staining as metal staining, leading to an ineffective (or unnecessary) sequestrant treatment."],"contributor":"waymark-seed","created":"2026-07-14T14:07:16.950Z","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/4d54fa6b-5936-4276-be7c-5d084240541a"}