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Mess from an air spade cleans up really well. It's the world's greatest leaf blower. Just blast it and it disperses really well.
But super helpful in de-compacting a very heavily compacted area. Not sure if thats the case here. But I have removed entire sod lawns and made them into root space with the SSAK. But I agree not the tool for RCX or areas where your coming into contact with roots.Supersonic air knife x-hfa is NOT root friendly in high flow mode (large nozzle, 90psi, 330cfm with 375cfm compressor). It will stir up massive amounts of soil, strip all roots clean of bark and send all silty soil particles airborne.
Handy to have on very rare projects where this capacity helps and roots are irrelevant (aerating my septic field). The "flame" of blue compressed air is wild to see as well.
Otherwise the smaller nozzle and compressor is best.