Pool automation has moved from commercial-only to standard equipment on most new Florida builds. The hardware is cheap; the plumbing choices that enable it are not. This chapter covers where valves, actuators, cells, and sensor chambers belong so the automation can actually do its job.
Valve actuators: the motor behind the handle
An automation valve is just a three-way diverter valve with an electric actuator replacing the handle. The controller sends 24-volt signals; the actuator rotates the valve between preset positions. Common placements:
- Pool/spa split— one actuator on the suction manifold, one on the return manifold. The controller swaps the system between pool mode and spa mode.
- Water-feature diverter— separate actuator lets automation run the waterfall or bubbler on schedule.
- Cleaner line isolation— actuator routes flow to the cleaner line when the cleaner is scheduled to run.
Install actuators where they can be serviced. A valve buried in a soffit or behind the heater will eventually need a new O-ring; plan for access at the time of install.
Salt-chlorine cell plumbing
A salt cell goes on the return line, downstream of the filter and heater, never upstream. Why:
- Downstream of the filter— debris or algae clogs would coat the cell plates. The filter protects the cell.
- Downstream of the heater— hot water and high-pH free chlorine back-flowing through the heat exchanger corrodes it. A check valve between the heater and the cell is mandatory.
- Horizontal run with unions— cells need periodic cleaning; plumb them so you can remove and replace without cutting pipe.
- Straight pipe on either side— most manufacturers require 6–12" of straight pipe upstream so flow isn't turbulent through the cell.
Probe and sensor chambers
ORP probes, pH probes, and amperometric sensors live in a small flow cell on a side-loop of the return line. The correct plumbing:
- Source water must be downstream of the filter (clean) and upstream of the heater (temperature-stable) and upstream of the chemical injection point(so you're measuring the pool, not the fresh chemical dose).
- Return the flow-cell water back to a pressure-side tee, not to the pump's suction. Suction can damage the probe membrane.
- Keep the chamber out of direct sunlight. UV degrades probe electronics.
- Label the isolation valves. The chamber needs to be bypassed for probe cleaning without shutting down the pool.
Chemical feeder placement
Liquid feeder injection points go on the return line after the heater (to protect the heat exchanger from acid and chlorine concentrate) and after the sensor chamber source point. A check valve on the injector prevents pool water from siphoning back into the chemical tank when the pump shuts down.
The fail-safe rule automation never breaks
Every reputable controller has a flow-switch or pressure-switch interlock: if circulation stops, all feeders must stop. Never bypass this interlock. A chlorine feeder running into a dead line builds up concentrated chlorine that dumps into the pool as soon as flow resumes — a chemistry spike and a liability problem both.
The best automation installs are the ones where the plumbing was laid out for the automation on day one. Retrofitting automation onto a hostile pad is twice the labor and half the reliability.