1. Air in the sight glass does not necessarily mean air in the tank.
2. You can install your own air bleed systems -- if needed -- with these items (plus tools and Teflon tape . . . and know-how):1/4" FIP brass tee3. Even if there's air in the tank, it may not be a problem. The two most common actual problems I've seen are:
1/4" MPT brass close nipple
1/4" MPT brass 2" nipple
1/4" brass ball valve, MIP x FIP(a) air blowback during pump serving, resulting loss of prime
(b) air dissolving into pool water, causing milky water that dissipates if the pump is turned off.
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