Using tons of titrating solution

[nitz369]

I have been shocking for 5 days now and going through TONS of the titrating solution, I'm afraid I will have to make another trip to Leslie's since my TF-100 refill won't be here until Tuesday.

Is there anyway to use less? Can I put in 5ml and count each drop and 1ppm? Or how would it work?

 

[257WbyMag]

Are you talking about the FAS/DPD titrating reagent? If so, are you performing the test using a 10 ml sample, in which case each drop represents 0.5 ppm? I always test this way. There really isn't much of a point to test to 0.2 ppm accuracy and you save lots of reagent that way.

Honestly, you may have to wait for Dave's refill to arrive. I know that neither of the Leslie's by my house even carry that reagent and when I asked them about it, they had no idea what I was even talking about. But, if you have placed the order already, it shouldn't take very long. Dave really gets his kits and stuff out there to you quickly.

 

[nitz369]

Well my question was if I use a 5ml sample would that make each reagent drop worth 1ppm instead of .5? I am trying to use even less, currently everytime I test I am using 30 drops.

I ran out of TF-100 reagent on Wed, went to Leslie's commercial store and got some and almost out again.

What do I do if I run out? I can't stock shocking till this is gone. I guess just dump in a bunch of chlorine constantly.

 

[chem geek]

Yes, you can use a 5 ml sample and each drop will represent 1 ppm FC. Since you are really just roughly estimating a high FC level you could use dilution with the OTO test -- diluting 1 part pool water with 9 parts filtered or distilled water which should read around 3 ppm FC on the OTO test. Though this isn't accurate, it will tell you the ballpark of having somewhere in the neighborhood of 20-40 ppm FC which is OK. However, it sounds like the 5 ml sample size with FAS-DPD will work for you.

Is your water clearing up?

Richard