{"id":"1dc71270-b743-4c66-b2c0-dc46a741d212","task":"Identify pool algae by type and select the correct chlorine-based remediation protocol","domain":"field-remediation","steps":["Visually identify the algae type: green algae (common, free-floating or on surfaces, cloudy green water), mustard/yellow algae (localized, often on shaded walls, chlorine-resistant, brushes off but returns quickly), or black algae (spotty, cyanobacteria with a protective outer layer, usually in cracks/rough plaster).","For green algae, brush affected surfaces, balance water, and shock with chlorine to a level sufficient to overwhelm the bloom, then run filtration continuously until water clears.","For mustard/yellow algae, brush vigorously (it resists chlorine more than green algae), shock at a higher dose, and treat all pool toys/equipment that contacted the water since it can survive off surfaces.","For black algae, physically break the protective outer layer with vigorous brushing before or during chlorine treatment, since chlorine alone often cannot penetrate an undisturbed colony, and expect to repeat treatment.","If using a copper-based algaecide as a supplement, follow label dosing exactly and check pH/water balance first, since copper products are more prone to causing staining when misapplied."],"gotchas":["Relying on algaecide alone without brushing and shocking is a common reason mustard and black algae treatments fail — mechanical disruption is necessary, not optional, for the more resistant types.","Copper-based algaecides can cause permanent blue-green or black staining on plaster/vinyl surfaces if overdosed or applied when pH/alkalinity are out of range — use sparingly and only per label directions.","Toys, brushes, and vacuum heads that contacted an algae-affected pool can reintroduce algae after treatment if not also disinfected."],"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/1dc71270-b743-4c66-b2c0-dc46a741d212"}