White Slime in Calcium reactor Ph probe

[Gungo]

Hey!

My calcium reactor PH probe is developing something like a white slime that is affecting my ph readings inside the reactor. I’ve tried cleaning for several weaks and recalibrating the probe but after 5-6 days the white slime is again on the probe. I am using a pinpoint PH probe that is a few month old bought brand new. Anyone has seen this before?

Thanks in advance.

Pics:

 

[vetteguy53081]

May be sediment or mulm from the melting media

 

[Gungo]

May be sediment or mulm from the melting media

Anything that could be done?