Help with Green Water !

[poolsr4fun]

Hi All,

New to this forum and I need some help. I have a new 27,000 gal. gunite pool. I have a SWG with a cartridge fiter. My pool water is clear but has turned a lime green. I tried shocking it twice over the last few days but no change. I had it checked for algae, negative. I had it filled with town water but top it off with well water.

I am hoping someone can steer me in the right direction.

My chemistry today is as follows;

TC 1.0
pH 7.2
Alk 110
CA 220
CYA 40

[Watermom]

Have you had it tested for metals in the water since you added well water?

[poolsr4fun]

No, not yet. Pool store tested the water. They told me no algae, so the problem was probably with metals, but they did not test for metals.

[Simmons99]

I have never heard of a "test" for algae before - so I cannot comment on it.

You need to get your iron level and copper level tested and then post the results - don't let them tell you that it's "normal"

If you have NO metals in your pool-my concern would be that your chlorine level is low. You should shock your pool up to 15-20ppm of chlorine and hold it there until the pool clears. Test your water 3x a day (this is where having a test kit is a good idea) and bring the chlorine level up each time with BLEACH. I don't recommend using your SWG to shock your pool.

Once the pool is clear - let the chlorine level drop NO LOWER than 3ppm-6ppm.

[poolsr4fun]

Thanks for the advice. I did have metals present and started with metal out.
It seems to be clearing.

Curious, why don't you like using the SWG to shock the pool?