Hayward Sense & Dispense Probe Maintenance: Cleaning Schedule And Replacement Guide

Probe Maintenance Schedule

Regular maintenance is the single most important factor in long probe life and accurate chemistry control. Probes that are never cleaned or calibrated accumulate contamination that accelerates drift and failure — and a drifting probe silently over- or under-doses chemicals for weeks before the discrepancy becomes obvious.

Task	Residential	Commercial
Verify OmniLogic pH vs. manual test	Monthly	Weekly
Clean ORP and pH probes	Every 3 months	Monthly
Recalibrate pH probe	After every cleaning	Monthly
Inspect probe cell for flow and scale	Every 3 months	Monthly
Replace acid feed tubing	Annually	Annually or per condition
Inspect acid supply container and fittings	Monthly	Weekly
Replace pH probe (GLX-PROBE-PH)	Every 1–2 years	Annually or per condition
Replace ORP probe (GLX-PROBE-ORP)	Every 2–3 years	Every 1–2 years

Probe Cleaning Procedure

What you will need

• Soft-bristle toothbrush (dedicated to probe cleaning — never used for anything else)
• Plain white toothpaste or mild dish soap (no bleach, no abrasives, no essential oils)
• Clean fresh water for rinsing
• Teflon tape (PTFE thread seal tape) for re-wrapping probe threads
• A small container of pool water for probe storage during the cleaning process

Step 1: Stop flow and remove probes

1. Turn off the filter pump or close the isolation valves on the probe cell sample line.
2. The probe cell is under low pressure — open a nearby drain or pet cock to relieve pressure before removing probes.
3. Unscrew the pH probe from the top BNC port of the probe cell. Immediately place the probe tip in the container of pool water — do not allow the tip to sit dry, even briefly.
4. Unscrew the ORP probe from the bottom BNC port. Place its tip in the pool water container as well.

Step 2: Clean both probes

1. Apply a small amount of toothpaste or a drop of dish soap to the toothbrush.
2. Gently scrub the pH probe tip (the glass bulb) with light, circular strokes. Do not apply hard pressure — the glass membrane is fragile.
3. Clean the ORP probe tip (platinum electrode) with the same motion. The platinum surface is more durable than the pH glass, but still avoid abrasive materials.
4. Rinse both probes thoroughly under clean fresh water. Ensure all soap or toothpaste residue is removed — residue left on the pH probe glass will affect the reading.
5. Inspect the probe tips visually. The pH glass should be clear and free of deposits. The ORP platinum tip should be bright and metallic in appearance. Stubborn calcium deposits that do not respond to toothbrush cleaning can be gently dissolved with a short soak in white vinegar (5–10 minutes) — rinse thoroughly after vinegar treatment.

Step 3: Replace Teflon tape and reinstall probes

1. Remove the old Teflon tape from both probe threads.
2. Wrap fresh Teflon tape clockwise around the threads (2–3 wraps). The tape should be applied in the direction of tightening so it does not unwrap when screwing in.
3. Reinstall the pH probe in the top BNC port and the ORP probe in the bottom BNC port. Hand-tighten only — do not use tools or overtighten the plastic fittings.
4. Restore flow by opening the isolation valves or restarting the pump.

Step 4: Allow stabilization, then recalibrate pH

1. Allow the probe cell to run with flow for 15–20 minutes before taking any readings. The pH probe in particular needs time to equilibrate with the water after cleaning.
2. Perform the pH Calibration Wizard using a fresh manual test result as the reference. See the pH Calibration article for the full procedure.
3. The ORP probe does not require calibration — verify the reading is tracking within 30–50 mV of a handheld ORP meter after cleaning.

Probe Storage

When probes must be removed for an extended period — winterization, system shutdown, or replacement delay — correct storage is critical:

• Short removal (under 1 hour): Store probe tips submerged in clean pool water in a small container.
• Extended storage (over 1 hour): Use dedicated probe storage solution (available from pool chemistry suppliers) or clean pool water in a sealed container. Snap-on probe storage caps are ideal and keep the electrode tip in its own reservoir of solution.
• Never store in tap water: Tap water has different ionic strength than pool water and can alter the probe's reference junction, requiring extended stabilization after reinstallation.
• Never store dry: A dried pH probe glass membrane may be permanently damaged and unable to produce an accurate reading even after rehydration.
• Never store in buffer solution long-term: Buffer solutions are for calibration verification only — extended storage in buffer alters the probe's reference potential.

Acid Feed Tubing Replacement

The peristaltic acid pump uses flexible tubing that is in continuous contact with muriatic acid. Replace this tubing annually regardless of visible condition:

1. Turn off the acid pump and close the acid container.
2. Remove the tubing from the pump head by releasing the pump head cover (refer to the specific pump model's manual for cover removal).
3. Note the routing of the old tubing — new tubing must follow the same path with no kinks.
4. Install new tubing of the correct diameter and material as specified by Hayward for your pump model.
5. Reinstall the pump head cover and confirm the tubing is seated correctly in the pump roller track.
6. Test the pump by running a prime cycle and verifying acid flows correctly to the injection point.