Just got my new 234 kit! I love new, everything's so clean, no DPD residue on everything! So, I was trying to decide what 'old' reagents to keep and decided on a side by side test to compare 'old' vs. 'new'. Here are my results:

New PS234:
FC = 19
CC = 0
TC = 19
pH = 7.8 - 8.2 (I have a little trouble distinguishing the pinks)
Alk = 100
Cal = 280
Cya = 40
Temp = 90

Old PS233:
FC = 10.5
CC = 0
TC = 10.5
pH = 7.2
Alk = 110
Cal = out of R-0010, last reading was 300
Cya = 40
Temp = 90


My biggest changes were in the FC and pH readings. This concerns me because of something I have have been trying to experiment with, as described in this post, http://www.poolforum.com/pf2/showthread.php?t=1097 . Rather than bothering myself with 'are the new reagents good', I am going with the safe assumption that the new kit is fresher, and my old reagents are aging. I thought my old reagents were fairly new, nothing older than a year. From now on I will make a copy of the reagent life chart, http://www.poolsolutions.com/kit/ps2...gent_life.html , and put in the dates I received the reagents so I will know if I need to renew. Sounds like annually is a must for the DPD FC test, but who would have guessed on the pH test? And it was off by a large amount.

In conlusion, anyone else who has a leftover PS233 may want to test the reagents before deciding to keep the old ones.

Hope this is of value,

Mike