The invention relates to methods and compositions that may be used in a pre-soak system which maintains whitening and eliminates concerns of chlorine stability. The filter element is provided for exchangeable use in a filter housing and comprises a filter body with a filter material that is arranged in folds. Enhanced event handling and dynamic service provisioning enable robust and flexible deployment of identification services in a distributed network. Examples of such representative signals are the digital input logic signals themselves, clock signals or line encoded signals.