CYA-comments after testing the 50 ppm standard

[pookiesunshine]

First, i recommend adding the cya standard to your next order from tftestkits.

As i suspected after reviewing some of the numerous posts on the cya testing accuracy and "when is the black dot considered gone?", I was off a little in my measurements.

After testing the standard and a sample, i have been reading approximately 10 ppm low, that is, 50 was really 60. So from now on, i am going to attempt to recreate the standard dot visibility, then proceed to my own concept of invisibility, and finally compare results. If i am more than 10 ppm off, repeat. although i dont expect to have to do this very often.

 

[slickraft]

I got the CYA standard solution too from TFTestkits when I took advantage of the TF-100 refill offer. Nice to have a confirmation that you are doing the CYA test correctly since the results can be so subjective.

 

[pooldv]

And remember when in doubt always round up to the next 10 on CYA. It is only 1 more PPM for FC. A little more chlorine is a LOT better than a little less. You'll never notice a bit mlre FC but the algae and bacteria will. It is safe to swim with FC up to shock level for your CYA, [FC/CYA][/FC/CYA]. Chlorine is your friend.