Cloudy water after a refill: normal, or a problem?

Cloudy water in the days after a refill or an acid wash worries people more than it should. It is usually normal, usually chemistry, and usually clears itself with the filter running.

Why fresh water clouds here

Valley fill water is hard and unbalanced. It arrives carrying a lot of dissolved calcium and it is not at the pH or alkalinity your pool wants. Out-of-range water is the single most common cause of cloudiness, and high pH with high calcium hardness will cloud a pool on its own by pushing calcium out of solution.

Freshly washed plaster is chemically active. A surface that has just been acid washed is raw. It releases material into the water for a period and changes the chemistry while it does, which is why the first week after a wash needs attention.

The filter is doing a lot at once.

Dust. A windy day or a monsoon storm puts a measurable amount of fine material into an open pool, and fine dust is exactly what makes water hazy rather than dirty.

The order that clears it fastest

Sequence matters, and doing it out of order is why some pools stay cloudy for a fortnight.

1. Run the filter continuously. Not on a timer.
2. Total alkalinity into range first, then pH. Alkalinity buffers pH, so adjusting pH first means chasing it.
3. Then chlorine.
4. Then check calcium hardness. Very high on a fresh fill means cloudiness may persist, and the answer is managing the water rather than treating the haze.
5. Brush walls and floor daily, which puts settled material back where the filter can catch it.
6. Clean or backwash the filter once it has worked hard, then again a few days later.
7. Only then consider a clarifier or flocculant, and only on balanced water.

Aftercare on a freshly washed pool

The first week matters:

• Filter running continuously for the first few days.
• Test daily, not weekly. A raw surface moves the chemistry.
• Brush daily.
• Expect a dust film on the floor initially, and brush it rather than worrying.

Balancing properly in that first week is also what protects the new surface. A fresh plaster face left in aggressive water gets etched, which is the fastest way to undo the wash you just paid for.

When it is not normal

• Still cloudy after a week of continuous filtration and in-range chemistry.
• Cloudy and getting greener, which is algae. See pool turned green.
• High filter pressure or weak returns, which points at the filter.
• Milky white and unresponsive, which on a fresh fill often means calcium out of solution.

What it costs

From the pricing page.

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If a freshly washed pool is not clearing, say so, and the chemistry can be walked through on the phone rather than charged as a visit. We cover Chandler, Gilbert, Sun Lakes, Ahwatukee, Tempe, and Ocotillo.