is this http://tftestkits.net/R-0013-Cyanuric-acid-Refill-8-0z-p52.html the reagent. if so why is it onyl .75 cents more expensive for double the amount of this one http://tftestkits.net/R-0013-2-CYA-Reagent-for-TF-100-and-K-2006-p42.html

I called and asked them that a couple of weeks ago and apparently it's just a quirk in the prices they get from their vendors if I understand correctly. The lady said some people still prefer the smaller bottles because they fit in the test kits better... I ordered the 8oz.

Yea, I just got the 8oz bottle, and refilled the smaller bottles in my K-2006. My pool had HUGE CYA level and the drain-refill-retest cycles ran me through the piddly amount in my kit in a week.

awesome thanks guys. any idea on the shelf life if it

The shelf life is several years if you keep it in a cool but not cold dark storage location.

great thanks jason. you wouldnt have a list of the shelf life of all the other reagents would you?

The specific storage conditions greatly influence the lifetime of some of the reagents. If stored properly everything can last two or three years. However, some reagents can go bad much more quickly if they are subject to prolonged high temperatures, freezing, direct sunlight, or frequent wide temperature swings. In the test kits we recommend, the FAS/DPD titrant (R-0871) is the most sensitive to aging. It should be a colorless liquid, but will turn dark yellow when it goes bad. The PH, TA, and CH indicators (R-0004, R-0014, R-0008, and R-0011L) are the next most sensitive. All of them will stain their plastic bottles when they start to go bad. The FAS-DPD powder (R-0870) will get darker and start to clump up when exposed to moisture, but is usually still good if it hasn't formed huge chunks or you can crush it back into small enough bits. Most everything else will last a good long time as long as it doesn't freeze or get left in the sun for an extended period.

ok good thanks jason