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Some have directed their rain water into their pools for an exchange.

Yes, you can do that. It will "waste" more water in the long run and require re-balancing each time, but I have seen several that chose that route. Each time you dilute, the next exchange requires more water to make the same percent difference in CYA level. 20% exchange still leaves you very...

Multiply by 3 because the tested sample is diluted with the distilled water. Which should then show as maybe 30 to 50 in the cya tube. 3x50=150 CYA which means you will need to exchange ~80% of your water to get to 30 CYA. About 50% to get down to around 80, which is at least a little more...

To get a rough idea of how much you will need to exchange to lower your CYA: Mix 10 mL pool water and 20 mL distilled water in a small glass (all measured with graduated syringe) - stir well. Take 7 mL of the mixed sample and put it in the CYA mixing bottle. Add 7 mL of CYA test reagent as...

CYA (Stabilizer) Minimum FC Target FC SLAM SLAMing is the process of raising your FC high and maintaining it there to kill algae and break down any CC that may have formed. “Shock” is highly misused word, often used for a variety of purposes related to the same goals as SLAMing. SLAMing is...

FC CYA chart

The algaecide may help prevent algae but it does not sanitize the pool for bacteria, etc like chlorine does.

Nice job!