co2 meter/tester

just wondering how often do you need to change the solution in the co2 indicator?

the drop checker is slower to react
i believe if not wrong its take 1/2 hr or so to reflect the reading so
dun be fooled by it.

the co2 needed is also related to your tank temp.
lower temp tanks like 25 or below = lower co2 dosage

Originally Posted by Anarchist

just wondering how often do you need to change the solution in the co2 indicator?

recommended by the person who sold me mine drop checker
is per water change

take out your drop checker from the tank, leave it outside tank for an hour. It should change to blue. If not change the solution

[Alvin Koh]

I am using the same drop checker from Dymax.

Ended up buying 2 because one of them came with a cracked drop checker solution which had dried up completely.

From the literature that's available on the net (BarrReport.com), it seems it's better to have a KH solution with a fixed dKH instead of tank water for a somewhat accurate reading.

For ~30ppm of dissolved CO₂, the solution should be approximately at 4 dKH - I've mixed up a 500ml solution of 4 dKH based on the instructions given and cross-verified it with a KH testing kit.

The response is slow indeed but it's sufficient to give an indication of any excess/deficit in CO₂ supplementation.