Added 100ml water to Crystal Chiller. Filter is somewhat yellowed. I checked the filter inside the enclosure (last week when repairing water leak), and it is does not show the same yellowing. The Crystal Chiller filter in the Chiller room is a different brand from the other filters. This yellowing may be filter brand specific. No debris noted in the filter pleats or in bottom of the canister. I did not add any water to the Diode Chiller. The Diode Chiller filter is clean and clear. Closing FAMIS #10506