Can I do the DPD-FAS chlorine test in my magnetic stirrer?

[salinda]

Can I do the DPD-FAS chlorine test in my magnetic stirrer? I have the original PS233 from PoolSolutions (don't worry--I update reagents occasionally) and it came with 2 Taylor sample tubes, one of them clearly marked "Chlorine test only." My stirrer is not the Taylor one but has a glass beaker and a plastic-coated stirrer. Is there a contamination issue or something? I have always wondered about this and it's the only drop test I am still mechanically swirling all these years.

Also, which reagents and indicators "go bad" more quickly?

 

[jblizzle]

You can use the stirrer for everything, there is no contamination if you rinse everything.
The chlorine only tube is just because the FAS-DPD test can discolor the plastic tube (you can clean it with muriatic acid).

You can find info about knowing when reagents go bad in this thread: http://www.troublefreepool.com/threads/24188-Extended-Test-Kit-Directions or Taylor also lists the info on their site somewhere.

 

[elwood58]

I use my speedster for the DPD-FAS Test every time. Add pool water first, then Powder, then drop the stir pellet in. Provides very consistent results.

 

[JasonLion]

The FAS-DPD test slowly builds use a milky coating on the test vial. The coating can be removed, but it takes a little effort.