{"id":"a54d4a90-e030-4569-b1af-07617cae92b5","task":"Set up an automated ORP/pH controller for a commercial pool, sized and specified to current NSF/ANSI equipment standards","domain":"nsf.org","steps":["Specify a controller (and associated probes/flow cell) certified to the current NSF/ANSI/CAN 50 standard for pool/spa equipment, since MAHC and most state/local commercial codes require NSF-50-certified controller equipment","Install the flow cell per manufacturer instructions in a location with representative, consistent flow (typically after the filter, before the heater) so ORP/pH readings reflect actual pool conditions","Calibrate pH and ORP probes against known buffer/reference solutions at installation and on the manufacturer's recommended recalibration schedule, since probe drift is a common source of over/under-dosing","Set ORP and pH setpoints to match the facility's target ranges under the governing health code, since commercial codes typically specify both a minimum ORP and a chlorine/pH range, not ORP alone","Configure chemical feed pump interlocks (flow switch, high/low alarm limits) so feeders shut down automatically if flow stops or a probe reads out of expected range, preventing overfeed","Establish a routine probe cleaning/replacement and manual chemistry verification schedule, since automated controllers should supplement, not replace, manual test confirmation"],"gotchas":["ORP alone is not an equivalent substitute for a directly measured free chlorine residual under most commercial codes — check whether the governing code requires measured FC in addition to an ORP setpoint","A controller without a flow-interlock safety shutoff can massively overfeed chemical if circulation stops while the controller keeps calling for chemical — confirm this interlock is wired in","Probe drift is gradual and won't necessarily trigger an alarm — manual verification testing remains necessary even with a controller holding a 'good' setpoint"],"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":"verified","url":"https://mcp.waymark.network/r/a54d4a90-e030-4569-b1af-07617cae92b5"}