How to Clean a Salt Chlorine Generator Cell

A salt chlorine generator is only as effective as its cell. Scale buildup on the titanium plates is the most common cause of reduced chlorine output — and in Florida's hard water, it happens every 60–90 days if left unchecked. Regular cell cleaning keeps your system producing at rated capacity and extends cell life significantly.

When to clean the cell

• Every 90 days as a routine maintenance item (every 60 days in high-CH water)
• When the system's “inspect cell” or “check cell” light activates
• When chlorine output seems low despite 100% output setting
• When you visually inspect and see white deposits on the plates

Visual inspection first

Remove the cell and hold it up to light. Healthy plates are smooth and silver/dark gray. Scale appears as white, chalky deposits between or on the plates. Light scale (thin white haze) can often be cleared with a garden hose and mild cleaning. Heavy scale (thick white crust) requires acid cleaning.

Acid cleaning procedure

Safety first: wear chemical-resistant gloves and eye protection. Work outdoors or in a well-ventilated area. Have fresh water nearby.

1. Turn off power to the salt system.
2. Remove the cell from the plumbing unions.
3. Cap one end of the cell and fill with a 4:1 water-to-muriatic acid solution(4 parts water, 1 part acid — ALWAYS add acid to water, never water to acid).
4. Soak for 10–15 minutes. You'll see bubbling as the acid dissolves the calcium carbonate scale. Do not exceed 15 minutes.
5. Drain the acid solution, cap the other end, repeat on the second side if needed.
6. Rinse thoroughly with fresh water — inside and outside — until no acid smell remains.
7. Inspect plates after cleaning. All plates should be clean and undamaged.
8. Reinstall and restore power.

What not to do

• Never use metal brushes or scrapers on cell plates — the precious metal coating is thin and easily damaged.
• Never soak longer than 15 minutes — extended acid exposure damages the titanium plates and coating.
• Never use concentrated acid — always dilute to 4:1 or weaker.
• Never clean a cell that still has power to the system.

After cleaning: address root cause

If you're cleaning the cell more than quarterly, check your water chemistry. Scale forms when the Langelier Saturation Index (LSI) is above +0.3 — typically from high pH, high calcium hardness, or high alkalinity. Lowering one or more of these parameters reduces future scale formation rate.

A clean cell at 70% output produces more chlorine than a scaled cell at 100% output. Don't ignore the “inspect cell” light — it's trying to save your expensive cell.