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Avoiding Surface Film in Drop Checker - any tips?

Ray

Member
Joined
31 Oct 2007
Messages
676
Location
Switzerland
Does anyone else get this? Apparently although surface agitation is enough to keep the surface clear, it still forms in my DC. Once it does I get a nice yellow result 24/7 which is confusing. If I re-fill the DC with air it clears but re-forms quite quickly unless I rinse it out.

How to stop this, should I be soaking it in bleach or boiling it or something?
 
I get it forming whenever I clean a drop checker out or use a new one. I find that after I remove it a couple of times it doesn't form again. Your drop checker's going yellow as the bacterial film (and I'm pretty sure it is a bacterial film that forms) respires CO2 so increases the CO2 concentration as well as reducing the diffusion across the water's surface in the DC.
 
Ed Seeley said:
Your drop checker's going yellow as the bacterial film (and I'm pretty sure it is a bacterial film that forms) respires CO2 so increases the CO2 concentration as well as reducing the diffusion across the water's surface in the DC.
I think you are right, but I was wondering, should I be sterilising my DC or something to try to stop it happening - i.e.. is it because I've got biofilm build up on the glass that spreads accross the surface?
 
I've always found it worse when I clean the DC! Just blow off the bacterial film for a few days and it then goes away for me! If that doesn't work then try the sterilisation and see what happens - it won't do any harm.
 
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