Alapool,

Hmmmm. I'm not so sure that immediate shocking is the path to take. The problem is you may precipitate out the copper that's in your water.

Perhaps Marie or Ben will see this post and can get on board and let you know if that .6 copper is an issue. I have never had metal issues so I have no idea if that amount needs attention or not.

I notice you've been using a sequestering agent so you must think it's a problem or someone else has indicated it is.

From other metal problems I've read about on the forum, shocking may actually aggravate your situation. No doubt you've got to get the algae taken care of...I'm just not sure how to go about it.

Dave S.