For the past few weeks I have been trying to get rid of some iron metal staining confirmed by the vitamin c test. The ascorbic acid and metal sequestrant (Sparkle Conquest) worked wonders and all the staining was gone. Pool looked great.
The pH, however, remained low for about the past 2 weeks (6.8-7.0 range). Yesterday, I noticed the pool appeared to have a slight green tint to it and some of the staining was returning some of the plastic fittings, skimmer, etc.
I checked the pool levels using the TF-100 kit and all looked fine. My FC chlorine was 3.0 and CC was 0. I wanted to bring the FC up just in case this was something organic. I was out of bleach so I added 2 bags of powder shock to bring it up quickly without having to max out the salt cell.
This morning, the pool, has a stronger green tint to it in the deep end. I'm now thinking that what I have is copper precipitating. I have another bottle of the Sparkle conquest metal sequestrant I could use but I'm concerned that with the ph being so low already, I may cause more harm than good. Normally, when I add metal sequestrant, the pH drops quite a bit. The heat exchanger in my pool heater is copper so I don't want the ph any lower than it currently is.
SOOO, looking at my levels below, how would you attack this? Raise pH, then add sequestrant, or just add sequestrant and raise pH after the fact. How long can I safely run with low pH levels? Does raising ph immediately after adding sequestrant affect the efficiency of the metal sequestrant?
Here are my current levels: