First, a little background: 45,000 gallon pool, cartridge filter, do run some trichlor in a feeder (balances with high evaporation and high alkaline well water)
I've had been working at (delaying) opening the pool for the past 3-4 weeks, but that was just to keep things from getting out of hand. The dog had pulled the seems out of my mesh safety cover and tore a huge hole in it so I knew I had a ton of debris in the bottom and wasn't ready to deal with it. So, I had done a shock and kept in some chlorine and the pool lost the green color, but was cloudy.
A few days ago, things went to green again and I could tell circulation was down on the pump. So it was time to get serious about opening things. I vacuumed the shallow end to waste and then used the leaf/debris remover you attach to the hose to take a ton of debris out of the deep end. I kept going until I wasn't getting a lot and then ran my pool cleaner and it wasn't picking up large amounts. I also took my pump apart and cleaned the impeller which had a lot of grass in it, and cleaned the filters. So I was starting with everything circulating strongly and clean filters. Algae wasn't a strong bloom, but definitely a good amount of dirt.
The SLAM and test
I started a slam last night with a CYA at 50 and a target FC of 20.
About an hour after adding chlorine, I pulled a test and barely registered any FC. But, then I got color back and then when doing CC, got a higher reading than the FC. I was wondering about washing out the test, but it had got dark, so I added more chlorine.
First thing this morning, the filters were plugged so I cleaned them out. Definitely algae as it was a little green and not a lot of debris as opposed to dirt which takes a lot of material to foul.
This time pulling the test, I watched it closer as follows:
FC: did the 10 ml test and didn't get any color until I placed the second scoop(using the speed stir). The initial read was a FC of 1. But if I let it sit a few seconds color would keep coming back. So I kept adding drops as it came back and got a reading of 5.5. It may have gone higher if I let it go on, but was staying clear after about 5 seconds.
CC - 1.5
CYA - 50 (from prior test)
TA - 120
PH - 7.6
CH - 200
This is the first time using the K-2006 test and I'm not sure of trusting the reading or not or how to determine the final. Am I getting wash-out? Should I be waiting for color to come back when doing the test?