Here's how:
1. Make sure you the K-2006 or K-1515 so you can manage high chlorine levels. (Test kit page in sig)
2. Get a K-2006 or HTH 6-way so you can test CYA
3. Buy undiluted, unblended dichlor from Sams Club (50# for $105) or Amazon Kem-Tek Dichlor 22.5 lbs
4. Buy undiluted, unblended trichlor from Sams Club (40# for ?? I forget, but cheap) or Amazon Kem-Tek 3" Trichlor 35#
5. If you use Amazon, get the 1 month Amazon Prime trial, so you can ship 2-day for free. (~$90 unlimited; remember to cancel if it doesn't work for you -- I live by it at Xmas!)
6. Get your CYA up to near 100 ppm by vacation. (The 22lbs of KemTek dichlor, in your pool, will add about 55 ppm of CYA to your pool)
7. Get a floater and trichlor (Sams Club or Amazon again)Kem-Tek 879 Pool Floating Tablet Dispenser Pool and Spa Accessories8. Shock the pool to 20 ppm FC before you leave, and then put the trichlor floater in, filled full, and turned down to the lowest setting.
Kem-Tek 3" Trichlor 35#
You should be good for a week, that way.
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