Liquid aeration for lawns

Rent the core aerator.

I got a big jug of liquid air8 i bought yrs ago maybe used twice, the best way to aerate is core aeration period, especially if you have compaction issue, and getting some organic material down to the clay to break it down, here in BR you can rent a aerator I think for 45 bucks for a few hrs.

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Good bad?

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By and large, “snake oil”. I’ve not seen any land grant (ag) university extension service recommend liquid aeration products - if they worked, they’d do so. Might show efficacy in controlled lab studies with certain types of soils, but not in the field. No harm in using them, just a waste of $.

Mechanical core aeration. I personally don’t use sand to fill in core holes, don’t see the need, but of course if you have un-level areas you want to fix, then use sand to do so.

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Wait until your grass is actively growing to sand level.

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Yeah, ain’t doing it till Summer

Ideally yes depends what you want the holes will somewhat fill in but it much better

Make sure to scalp before you level.