Pool automation has progressed significantly beyond scheduling lights and pumps. Modern integrated systems from Pentair and Hayward can continuously monitor water chemistry parameters and automatically dose chemicals to maintain set points. This creates real changes in how service techs manage automated accounts — and real questions about which tasks are handled by the system and which still require a visit.
Automated chemistry monitoring uses electrochemical sensors continuously in contact with pool water. The two parameters that can be monitored and dosed automatically with current technology:
ORP measures the oxidizing power of pool water — essentially the water's ability to oxidize and destroy pathogens. A properly sanitized pool typically reads 650–750 mV. ORP correlates with free chlorine availability but is also affected by pH, CYA, temperature, and TDS. This correlation makes ORP a useful secondary indicator rather than a direct replacement for reagent FC testing.
The Pentair IntelliChem and Hayward HydroSense controllers use ORP as the primary sensor for automated chlorine dosing. When ORP drops below the set point, the controller activates a liquid chlorine peristaltic pump or tablet feeder to raise the chlorine level. The sensor requires calibration and periodic cleaning to remain accurate.
pH probes in inline sensor housings provide continuous real-time pH monitoring. Unlike ORP, pH measurement is more reliable and direct from a sensor than from a chemical test. When pH drifts above the set point, the controller doses muriatic acid to bring it back. Pentair IntelliChem, Hayward AquaRite Pro, and standalone chemical controllers from Pulsafeeder and Stenner all use continuous pH monitoring for automatic dosing.
Pentair IntelliChem ($800–$1,200 for the controller) integrates with IntelliCenter automation to provide automated ORP and pH monitoring with corresponding chemical dosing. The system:
Installation requires a flow cell plumbed into the equipment pad return line, two chemical tank storage areas (typically secured enclosures), and two peristaltic pumps. Total installed cost for a full IntelliChem system: $2,500–$4,500.
Hayward's HydroSense chemistry module adds similar automated pH and ORP monitoring to OmniLogic automation systems. The HydroSense unit costs $600–$900 and pairs with OmniLogic's app interface for remote monitoring and alerts. Hayward's approach emphasizes integration with their AquaRite salt systems — on SWG pools, the SWG handles FC and HydroSense handles pH monitoring and acid dosing.
Despite continuous pH and ORP management, these parameters remain beyond current residential automation capability:
| Parameter | Automated? | Service Visit Required? |
|---|---|---|
| Free Chlorine (reagent verification) | ORP proxy only | Yes — ORP calibration check |
| pH | Yes (IntelliChem/HydroSense) | Sensor calibration monthly |
| Total Alkalinity | No | Yes — reagent test, manual treatment |
| Calcium Hardness | No | Yes — reagent test, manual treatment |
| Cyanuric Acid | No | Yes — turbidity test, drain if needed |
| Combined Chlorine / Chloramines | No | Yes — FAS-DPD test, shock when needed |
| Visual inspection and cleaning | No | Yes — every service visit |
| Filter condition assessment | Pressure monitoring only | Yes — manual inspection |
Automated chemistry systems reduce the crisis management component of pool service — the "got a call that the pool is green" scenario becomes far less common when pH and ORP are maintained continuously. What they don't change: the TA, CH, CYA, and combined chlorine management that requires reagent testing and manual treatment. Automated accounts still need regular service visits; the visits just tend to find fewer chemistry emergencies.
The most important limitation for service techs to understand: ORP and CYA interact in a way that can fool automated systems. As CYA rises (from ongoing trichlor tablet use), a larger fraction of chlorine is bound in the CYA-chlorine complex and is unavailable as active sanitizer. ORP reflects the actual active sanitizing capacity — not the total FC — so as CYA rises, ORP drops even if FC test results appear adequate.
A pool with 150 ppm CYA might register a low ORP (600 mV) while showing 4 ppm FC on a test kit. The IntelliChem sees low ORP and doses more chlorine — but the problem is CYA accumulation, not insufficient chlorine. The automated system will continue dosing without resolving the underlying issue.
This is precisely why service visits with accurate reagent testing — particularly CYA measurement — remain essential even on fully automated accounts. The sensors know what they know; the complete chemistry picture requires a technician with a proper test kit.
Managing an automated chemistry account requires a slightly different approach:
Automated accounts are excellent candidates for service upgrades and equipment monitoring. When the controller has been running and the chemistry is well-maintained, your visit's value shifts from reactive chemistry correction to proactive equipment inspection, maintenance, and relationship management.
Use SplashLens for your reagent chemistry calculations on automated accounts just as on any other. The automation handles the daily FC and pH — you handle the weekly full chemistry picture that the sensors can't measure.
SplashLens covers every parameter that automation can't — TA, CH, CYA, CC, LSI — free, offline, every stop.
Open SplashLens Free →Partially. Chemical dosing controllers (Pentair IntelliChem, Hayward HydroSense) can automatically dose acid and chlorine to maintain pH and ORP set points. They cannot automatically manage TA, CH, CYA, or combined chlorine — these still require manual testing and treatment by a service technician.
Pentair IntelliChem is an automated chemical controller that measures ORP and pH continuously, then doses muriatic acid and liquid chlorine to maintain set points. It integrates with IntelliCenter automation. Cost: $800–$1,200 for the controller, plus chemical feeders and installation totaling $2,500–$4,500 complete.
ORP measures the sanitizing power of the water indirectly — it correlates with free chlorine availability but is also affected by pH, CYA, temperature, and other oxidants. At high CYA levels, ORP readings can be misleading. Most professionals use ORP as a secondary indicator alongside traditional FC reagent testing.
No. Current automation handles pH and FC maintenance between service visits but cannot perform visual inspection, equipment assessment, surface cleaning, filter maintenance, or manual chemistry tests for TA, CH, and CYA. Automation makes technicians more effective; it doesn't replace the service visit.
Pentair IntelliCenter with IntelliChem, Hayward OmniLogic with HydroSense, and standalone chemical controllers from Pulsafeeder and Stenner provide automated chemical dosing. Fully integrated systems that manage both FC and pH run $2,000–$5,000 installed.