Do TF Test standard solutions have shelf life?

CPM10V

Active member
Jun 12, 2019
30
Phoenix, AZ
I have the set of standard solutions from TFTestkits, they’re approx a year old. I filled the CYA testing tube up to the 50 mark as noted on the standard bottle but the water was perfectly clear. Shouldn’t the black spot on the bottom not been visible? Wondering if the solutions are too old? Thanks.
 

Rancho Cost-a-Lotta

Silver Supporter
Apr 10, 2018
1,425
Rancho Cucamonga, CA
The post below shows a photo of the standard sample by @PoolGate a couple years ago. The dot is still visible, but not perfectly clear. This should give you something to compare to.
 

CPM10V

Active member
Jun 12, 2019
30
Phoenix, AZ
The post below shows a photo of the standard sample by @PoolGate a couple years ago. The dot is still visible, but not perfectly clear. This should give you something to compare to.
Thanks for the link I’ll try testing again I’m going to go beyond 50 to see if anything changes I also checked it inside I’ll go outside and more light and see if anything is different
 

Holydoc

Gold Supporter
Jul 17, 2016
353
Navarre/FL
CPM,

I had bought the standard solution to try to practice getting the correct CYA as well. My standard solution worked GREAT right out of the gate after I bought it. However a month later, mine acted like yours and I could not get it to cloud up. My conclusion was to trust myself and just start testing the CYA using the methods posted in Pool School. By adding some solution, and then peeking quickly at the tube to see if I can see the dot, it seems to work great for me. As soon as I cannot see the dot with my quick glance, I record the CYA value and do it again. I repeat it by pouring the liquid back into the squeeze bottle, shaking, and then repeating the test. If I get the same answer twice in a roll, that is what I use for my CYA.

Good luck! The CYA is the hardest and most subjective of the tests. Just trust yourself and repeat to verify.
 

Donldson

TFP Expert
LifeTime Supporter
Jun 12, 2009
4,234
NW Ohio
Years ago in I worked running a machine in a factory. I put the resistor in to spark plugs. Surprisingly rewarding work and I was really good at solving problems and making adjustments so the product came out in spec and the machines ran like clockwork. One day I came in on Monday morning to start things up for the week and couldn't get any air pressure. Called a millwright. He showed up, pulled the release valve, and my machines sprung to life. I smacked my forehead, laughed, and thanked him.

It's a moment that will forever stick with me as a reminder: don't assume someone didn't miss something obvious because I sure as heck do sometimes.
 
  • Like
Reactions: CPM10V