How do I know if my drop checker is working?

[peaches]

I set up my CO2 yesterday so it has been hooked up for 24 hours approx. but I turned it off overnight. Today it came on at 10am. I have experimented with position of atomiser but have left the drop checker alone. The water is still fairly dark blue, but I decided to test my pH with my API kit. My pH was 7.4 and now its 6.6 but the drop checker still hasnt changed colour.

Does this mean its incorrectly positioned? Or is it because I didnt buy 4DKH water and just used tap water?

 

[G H Nelson]

Hi
Yes!
Purchase a All in One fluid!
https://www.aquaessentials.co.uk/neutro-bromo-blue-100ml-p-2425.html?cPath=194_199

hoggie

 

[ian_m]

https://www.ukaps.org/forum/threads/how-to-check-your-drop-checker.43373/

 

[peaches]

I have just put some white plastic behind it and it has turned green I just couldnt tell, it looked the same blue colour. Thankyou both for troubling to reply.