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TROUBLESHOOT

Green pool water

Result

This is the point where a technician costs less than more chlorine

This one is a technician's job

We cannot call it from here — we have narrowed it to a short list, but it takes a measurement or a look at the real thing to know.

A pool with no visible floor, or one that is dark green-black with slimy walls, usually has a chlorine-tolerant algae, and clearing it takes several times the normal dose together with a real water test to find out whether the chlorine going in is being locked up. Guessing at this stage typically means buying chlorine two or three times over and still not clearing — which costs more than the visit. Reaching this answer is not a failure on your part, and it is not the guide giving up: it is the correct answer to these symptoms.

We stop here because the next step needs an instrument, or carries a risk not worth taking on. Handing this to a technician is the correct answer to these symptoms — not a cop-out.

What to do

  1. 1

    Keep everyone out of the water. A pool where you cannot see the floor is a pool where you cannot see a person on it.

  2. 2

    Keep the pump on its normal 8–10 hours a day. Switching it off makes things worse, not neutral.

  3. 3

    Net out as much leaf and debris as you can — it reduces the chemical load before we arrive.

  4. 4

    Call us with three things ready: the pool's dimensions, whether it is salt or hand-dosed, and how many days it has been green. That is enough for us to plan before we leave the office.

Read the full article: Clearing green pool water

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