Chlorine level

[JimK]

That is perfect! That is liquid chlorine with NO CYA. Remember, you need to get the FC up to about 22ppm and keep it there by testing and adding until you pass the overnight test.

Agreed.

Keep in mind I'm no expert, just a forum member who's been here awhile. Unfortunately the "experts" that use to post here haven't posted in a long time.

It's important to keep FC at shock level until 3 criteria are met;

1. Water is clear; no visible algae
2. < .5 CC (combined chloramines)
3. Overnight FC loss is 1ppm or less.

As was stated, do not use anything that contains CYA, i.e. pucks, sticks, DiChlor, trichlor, etc. stick with plain bleach (no scents, no splashless varieties) or "liquid chlorine". Bleach and liquid chlorine (they are the same thing actually, just perhaps different concentrations) do not add CYA.

Do consider a partial drain/refill to lower CYA. 90 is pretty high, requiring more FC to perform a proper shock. Unless you are using a SWCG, your CYA should probably be 30-50ppm.

I hope this helps.