New SWCG user.

I setup my 23 foot round above ground pool with a Hayward Goldline AQ-TROL-RJ-TL AquaTrol Above-Ground Pool Return Jet pool Chlorinator.

Running 6 hours (3 in morning 3 at night) 60% output on the SWCG.

Even before switching to salt i would get Green-like algea on the sides and bottom of the pool.

I can scrub with a rag and filter/shock the pool and it goes away.

Since switching to Salt it appears the issue still occurs once the Free Chlorine level drops below 3.

I tried to get my levels into to ideal values but i'm still not able to. Pool is clean with no other issues.

Last check of level are as follows

Hardness = 0 (Do i even need to worry about this ??)
PH = 7.0 (on the lower end)
FC = 10 (shocked yesterday) Has always been fine only level I can manage
ALK = 60-70 added 3 lbs of baking soda very little change (added 3lbs before switching to salt as well) can't get this to higher levels
CA = 30-40 Added 5lbs before switching to salt level hasn't changed
Salt = 3200-3400 (stable)

Any suggestions on the green algea.. is it just lack of chlorine.

Thanks for your help.

Quote:

---

Originally Posted by masssilverf150

Even before switching to salt i would get Green-like algae on the sides and bottom of the pool. I can scrub with a rag and filter/shock the pool and it goes away.
Since switching to Salt it appears the issue still occurs once the Free Chlorine level drops below 3.

---

Sounds like mustard algae; keep your chlorine ABOVE 3.0 100% of the time.

If you switch get a DPD-FAS testkit, so you can actually *measure* levels above 3, you can probably fine tune it more than that. (We call them 'guess'-strips for a reason!). Check out the test kit link in my signature if you are interested: get either the K2006 OR the K1515. And no, they aren't available locally.