hi all back again . have some green in pool

[airraid1999]

21 ft round 54" tall i think its 11000 gal. i look at last years reading and never really had cc reading and fc is way to low am i correct in saying that cc should be 0.5 or less?

[airraid1999]

got these # this morning before sun hit pool
fc-3.8
cc-0.8
ph-7.4
ta-100
cya-60
temp -cold very cold
water still cloudy can see brush in bottom but that's it I think allot of debris came off winter cover as when I moved it again allot of dusty material came off and could see where it was breaking up (3 years old) but warranty said 7 years go figure

[BigDave]

You need to add 3 gallons of 6% bleach to get up to your shock value of 20ppm FC. Run filter with pump on low 24/7, backwash as necessary (when pressure climbs 8psi or so over clean). Test as often as you can and add bleach as necessary to bring FC back to shock value. Brush the pool after adding bleach.

As you report 3.8 and 0.8 , I presume you're using the 25ml sample when testing chlorine. You're reagents will last much longer if you use the 10ml sample (remember to multiply by 0.5).

BBB for clearing a dirty pool:
Bleach - Bleach - Bleach and Brush - Brush - Brush

[airraid1999]

yes using 25ml but was tring to get exact #s till i get control of water

[BigDave]

Don't need accuracy, just reliability to control the process of cleaning up your pool. However, if you run out of reagents and have to wait for delivery you won't know what's going on to any level of accuracy.

[Watermom]

And, to answer one of your questions from one of the posts you wrote earlier, you do want the CC to be no greater than 0.5ppm.

[airraid1999]

New #s today lmk if all looks good losing some cya?
Temp=86
fc-11.5
cc-0.5
ph-7.3
ta-110
cya-45 test take after a full sun day very hot!
C hardness-200
s index- -0.2