SWIM has 2 brew jars sitting in room temp for over 2 n half weeks now waiting for a first naptha pull on one jar and a second with recycled naptha in the 2nd

are these brews still good to siphon naptha layer and freeze precp?

or is it not safe to use solutions and start afresh?

All's good. Go ahead and do your pulls, then do some more Do 3-4 on each, you can freeze precip pulls 1 & 2 but after that you'll need to evap to 1/2 first then freeze, or you can combine all pulls, evap to 50% then freeze.

Ive let my solutions sit for weeks before, maybe even like a month, and was still able to pull some more magic.