The simplest (and most limited) way is to use tables. Look up your depth and time on an appropriate table and it'll show you your deco stops or lack thereof.
It happens to both of them, I've tried lubricating it with various things but nothing has worked very well. Eventually I swapped it for a Kent Tooling CO2 SMB for my backup and an AP Buddy crack bottle for my primary.
My Mares SMB (my wife also has the same model) sticks at the internal baffle making it very difficult to inflate using exhale breaths or with an AAS. I find the inflator tube is poor quality and leaks too.
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