Thanks Blair,

I haven't seen an aerator link that produces over 5 psig. Any leads?
Also, about how many scfm do I need?

Figured the bubbles wouldn't be the best - is it CO2? Also was a bit of slime on the weight each time. Last swam In it 10 yrs ago and it was very uncomfortable walking - the bottom was slimy.

Thanks,
All_wet