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In CA, we use 4" concrete slabs. full blown mortar beds, and grouted joints. Lawsuits would happen if we did it any other way guaranteed.
If the stones are for informal gardens, dirt or garavel joints are fine, however this Poly sand seems like a quasi-flagstone job, so I'd simply fill the joints with a nice pami-pebble type stone (very colorful and smooth) 1/4" size and it doesn't track into the house.
It looks fantastic when wet and you'd be their hero!
Another option would be to fill with a panters mix and plant some Isotoma, Irish Moss or other creeping type groundcover.
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