CSI and My Test Numbers

[mcdickey]

Here are my test numbers from this morning taken with my Taylor K-2006C and Taylor K-1766 kits:

FC 6.5
PH 8.0
TA 50
CH 230
CYA 40
Salt 3000
Temp 65 degrees
CSI -.31

I have a plaster pool and understand that I want to keep my CSI above -.6. MY CYA is low and once I bump my CYA up to the recommended level of 70 that change will drive my CSI down lower than it should be at -.65 if I maintain a target level PH of 7.8. Do I need to bring my TA up to 70 or so in order to keep CSI above -.6 and maintain recommended PH levels? Or, alternatively, should I keep my CYA as is for the cooler months and bump it up to 70 next summer? Any thoughts would be appreciated. Thank you.

 

[mknauss]

Leave your CYA were it is for the winter. The SWCG will quit generating in the next month as your water will cool below ~58F. You will use liquid chlorine to maintain your FC based on [FC/CYA][/FC/CYA] until your water warms.

Your CH and TA will climb as you add fill water. So I would not over react. Lower your pH to 7.8 and if you need to, add a touch of baking soda to bring your TA to 60 or 70 ppm for the winter.

 

[mcdickey]

Thank you for your quick reply. I'll stop and buy some baking soda on my way home.