Clear fluid in older Lava Lite

[William Bowen]

Looking to buy 'another' older Lava Aristrocrat, however this one is a little low on clear fluid.  I know these need some air, but this one it too low. Is it possible to add something to one of these 70's models to get the correct levels back??
Thanks!

[Tim Gill]

Depending on how low it is you could add some DI water - that should work.