>     IMO, once per day or even once per shift is not frequent enough.  
>     There are too many variables that affect exposure; hold times 
>     after lamination, artwork density, developer changes, just to 
>     name a few.  We take our steps on every job.

By every job, do you mean on every panel? Remember that step tablets result 
in partially polymerized resist which can come off the board and contaminate
your developer solution. You should keep the number of tablets run to the
minimum necessary to avoid redeposition of resist particles.

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