empty tank, low pH?

[ReefTourist]

The fluid was pinpoint brand pouches. Two (7&4) came with the pinpoint meter, and I bought 3 more sets of the same brand (7&10) to go with it from MarineDepot. Kinda hard to return used pouches, but I'll contact them to see if there's anything they can do.
We found it was bad by calibrating with bottled KentMarine calibration fluid at the LFS.

 

[reverendmaynard]

There's an article in the reef chemistry forum about calibration fluids. A link can be found in the sticky thread "Reef Chemistry Articles".

I don't remember others, but I know hannah was on e of the good ones. Availabe at Drs F&S.

 

[ReefTourist]

I sent an email to MarineDepot about my problems, and they have shipped out replacement calibration fluids to me!