How to use tds calibrating fluid?

[fishkeeprian]

Hello,

Just wondered how you use the bottle TDS calibration fluid so you don't contaminate it?

Thanks

 

[thegrun]

I like to use the Aqua Craft solution, it has a built in dropper so you don't have to worry about contamination. Otherwise use a clean pipette and clean it well after use with RO/DI water.