Thanks. There is an attached spa. The 1" line that pokes up next to the equipment is capped (not sure what it is). Does this mean it can't be the air line? Is the air line a requirement? If the 2", uncapped line, is the air line, will it cause any problem to let water run into? I'd imagine it won't but, I thought I'd ask just to be sure... maybe I'll turn on the spa and see if i feel air being sucked into the 2" line.
If it turns out that the 2" line is the dedicated vac line, I'm guessing I would need someone out to professionally install a booster pump into my equipment. Yes?
I'll mess around tomorrow and see what happens - Thanks!