Is it possible to use an already extracted basified solution again?
There are about 2.5L filtered and basified solution from two A/B-Extractions. Is it possible to use this solution again to raise the pH in another A/B or STB extraction?

I think it should be possible to use this solution again, if some more fresh lye would be added.

Has somebody ever used the old pH 11-13 solution with fresh pre powdered MHRB?

Never tried but I do not see why this would not work. However, this will add to your fresh mimosa some of the remaining stuff from the old (tanins, oils). But I guess it is negligeable especially if it is filtred.

I also suspect it would work
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But
why would you want to?
Lye isn't expensive
Basified solution isn't difficult to dispose of

but most importantly, it's most definitely not a good idea to have used drug making by-products in your possession. Best to get rid of it and start again next time you're ready

I'd say it's handy when working through a kilo or so of MHRB, when you run out of distilled water, and most importantly, when you think there's remaining product. It's a good way to put older stuff aside for extensive extraction. You're right though, I wouldn't keep it around for too long; get all extractions out of the way as soon as possible, but as long as you've still got fresh extractions going, I'd say it wouldn't make a hell of alot of a difference in the eyes of the law.

Just so far in my experience distilled water or tap water make no difference
I think the molcule would best enjoy a 'natural' water bath. So next time your up in the hills and find some nice natural spring water, maybe collect some of that and help keep those little spicy molecules happy

I'll drink my tap-water all day long, but I'll be damned if I let any possible mishaps or impurities regarding the plumbing or water supply ruin a batch of spice. Distilled is so damned cheap anyway.

I've used the pH13 Solution from extraction one and two for my third extraction. It worked very well, it was so alkaline it worked without fresh Lye.
The amount of extracted spice was the same as with fresh Lye solution. The spice was cristaline-white.

chlorine in the water can destroy special molecules. molecules dont care about whether or not the water is "natural" or not. the less ions you have in the water the easier it is for the human to control the pH and avoid unwanted impurities hence why distilled water is better. however for these kind of extractions its usually crude anyway so its up to you.

It isn't easy to get and has cost. Also disposing can cause somewhat environmental damage and contains traces of naptha or other NP solvent.
Important thing to note is that that solution may still contain allot of DMT