Algae Takes Advantage of Gaps
Warm water, sunlight, low sanitizer, poor circulation, and surfaces that are not brushed create an opportunity for algae. The first visible spot may be small, but it often points to a local condition: a dead zone, a clogged filter, a blocked return, or a testing process that missed the decline.
Keep the System Unfriendly to Growth
- Maintain sanitizer and pH within the facility's approved operating range.
- Brush walls, corners, steps, gutters, and other surfaces on a written schedule.
- Verify circulation at returns and inspect areas that consistently look dull or stagnant.
- Clean filters and remove debris before pressure and flow problems compound.
When You See Color
Confirm the observation and test the water before adding chemicals. Inspect circulation, brush the affected area, and follow the facility's approved treatment procedure and product label. Keep swimmers out until the water is clear, balanced, and within code requirements. If the problem returns, investigate the cause rather than repeating a larger dose.
Record where the algae appeared, what the readings were, what action was taken, and when the pool reopened. That record can show whether the solution is chemistry, cleaning, circulation, or a maintenance repair.