Update, water seems to be a lighter green, brushing seems to produce smaller clouds of brown than before.

Numbers of 6/3 Just before adding 10 Gallons of Liquid Chlorine and brushing. Use slide and have returns pointed to surface to aerate. Also filtering again.

FC 3
PH 7.4
TA 177
CH 176
CYA 14

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Numbers of today, just before another 10 Gallon liquid chlorine dump. Filter seems to be a lot cleaner. Still use slide and returns to aerate. The returns make the water ripple (no bubbles)

6/4

FC 1.33
PH 7.10
TA 188
CH 163
CYA 83

Don't have the K2006 kit yet. CYA number seems strange compared to previous measurements.

It's good that Fleet Farm has the chlorine on sale,

Thanks in advance for any advice/comments etc.