I have a RedSea marine care test kit and a RedSea reef foundation test kit. Today I used both to check my alkalinity. Huge difference in the readings. The reef foundation alk test returned a Alk of 5.9 and the marine care test returned a reading of 8.5. I tested with both multiple times to ensure I wasn't doing something wrong and got the same result every time.
They both have an expiration date of 11/18. Which one should I rely on?
They both have an expiration date of 11/18. Which one should I rely on?