Pool getting green - DE in the pool?

[apv]

Forgive me Father for I have sinned.

I was a faithful TFP disciple a while back -- and then made a deal with the Devil and hired a pool cleaning company. I swear, Father, I did it for good reasons -- I needed someone to watch the pool while we were out of town for extended periods of time (and no pool company would do one-offs).

My pool is turning green -- I think it is because the kid doing the pool simply jammed up CYA using tablets.

They say that I must have a broken or malfunctioning filter fin that allows DE back into the pool -- which then, according to them, interferes with the effectiveness of chlorine.

There is some substrate on the pool -- hard to tell what it is -- algae, pollen or DE.

I checked the filter fins -- and they look fine to me.

Question to the TFP faithful -- is DE slipping back into the pool even a thing? If so, can it actually interfere with chlorine's efficacy?

READINGS

110 ppm Alkalinity

5 ppm Chlorine

7.9 pH

400 ppm Hardness

90 ppm CYA

 

[mknauss]

Drain 50% of pool volume and refill. Follow the SLAM Process

 

[apv]

Drain 50% of pool volume and refill. Follow the SLAM Process

I'm familiar with that -- so you're saying that DE in the pool is NOT a cause of algae?

 

[mknauss]

DE in the pool has no effect on the water chemistry.

Time to read Pool Care Basics

 

[bobloblaw42]

DE does not interfere with chlorine, whether in pool or in your filter. CYA is high and therefore you have a FC problem. CYA 90 recommended level is 10-12 FC. Near zero chance that 10-12 FC is the level your pool service has maintained daily for your pool.

See solution in first response to your post.

Swimming Pool Algae: Basics and Prevention

The best offense is a good defense: prevent algae in your pool with chlorine, and avoid expensive algaecides and shock! No more green pools!

www.troublefreepool.com