Where is the blower? I do not even see it in any of the pictures. I would think that the blower would be attached to the pump that it next to the heater (assuming that is actually for the jets). That may be a completely separate loop of plumbing that is not attached to the filter/heater plumbing at all.
If the setup is indeed split like that. You likely only have 1 of 2 returns that are circulating for the heater and these are different than the jets.
If the setup is indeed split like that. You likely only have 1 of 2 returns that are circulating for the heater and these are different than the jets.