Problem of filter-wash cycle

Hi,
I’m working on the biofiltre modelling in WEST, which needs to build a filter-wash cycle in model. I have some calculation problems in the control of the cycle when run simulation. I wrote my codes and the description problem in the attachment.

Thank you very much for your every time’s help.

Best Regards.

Jialu ZHU

Dear Jialu ZHU,
I reply to your question has been sent to you via email.