Episode 25

Why is My Pool Green?

Swimming pools can turn green for several reasons. There are three main ones: copper oxidation, an imbalance of alkalinity and calcium, and of course the biggest culprit, algae.

Rule Your Pool · Jarred Morgan, Eric Knight

June 2, 202128m 44s

Original episode page

Show Notes

00:00 - Intro

01:43 - This pool wasn't an opaque green, it was translucent, tinging green.

02:09 - We know of at least three reasons pools turn green.

03:11 - We could safely rule out copper for this customer.

03:43 - Jarred is a popular guy (phone rings).

04:50 - The next day, the water was perfectly clear and blue, by increasing calcium relative to alkalinity.

05:48 - We don't know why, but if you have too little calcium hardness relative to alkalinity, the water can turn green (but clear).

06:18 - Dr. McNamara: Optimal ratio to inject CO2 is 4:1 (calcium to total alkalinity). If you're under 3:1, water can start to tinge green.

10:43 - The white bucket test (add chlorine to green water and observe color change)

18:08 - If you have algae taking over your pool, your algae is outpacing the killing rate of chlorine.

19:12 - Control what you can control. CYA and chlorine, phosphate levels (indirect relationship, but important). What really matters is your free chlorine and CYA.

24:00 - Wrapping up with two more topics: CO2 feeders and Potassium Monopersulfate. Both can fuel algae growth.

27:21 - Summary: pool can turn green for three reasons: copper, calcium/alkalinity imbalance, algae.

27:55 - Thank you for listening!

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