hawk
I use web filtering and am very happy with it. Is there perhaps any way that it can be set to operate at certain times. For instance, at 07h00 each morning it will be enabled and then at 17h00 be disabled again.
I do a similar thing with Dansguardian.
I have 2 sets of config files (eg day & night), one to allow unblocked access from all workstations (eg for updates & maintenance etc) & the other to enable filtering.
I created a morning & afternoon cron job to copy the appropriate file set to the main Dansguardian config & then restart Dansguardian so the new config takes effect.
I do not know which "web filtering" you refer to, so cannot comment more specifically.