Bubble counter fluid

[cbwmn]

What do most folks use in their bubble counters?
I read somewhere that pure glycerine is good because
it’s viscosity is thick enough to make bubble counting easier.
Is this safe??
Thankyou
Charles

[Purrbox]

I use plain ole tap water. You have to refill them every few months due to evaporation, but that's not a huge issue.

[Ruadh]

I saw quite some time ago where someone used vegetable oil.
I tried it and after a couple of months it was all cloudy, it was hard to clean out completely.
Now I just use the syringe that comes with the test kits and top it up with water from the aquarium.

[timwag2001]

i use distilled water

[neilanh]

tap water

[ingg]

glycerin works well with lower bubble counts, sorta foams at high bubble counts though. Doesn't evaporate.

[mgamer20o0]

i just use water. never heard of anyone using glycerin though not saying people dont.