Is it ok to leave some of the old nute waters in res tank when filling it, or should i empty it completely before?

So i have this autopot system and recently started using nutes in it, because i vegged for so long that biotabs started to run out of nutes and plain water with supervit did not do it anymore. It is a passive hydro that does not circulate water, if that makes any difference. Using remo nutes with AN nirvana and GH Roots(also just ran out of hesi super vit and AN rhino skin, which i might get more of, unless the remo nutes i bougt can give what they also give) in the res tank.

I started...

Is it ok to leave some of the old nute waters in res tank when filling it, or should i empty it completely before?

from Hydroponics / Aeroponics https://www.rollitup.org/t/is-it-ok-to-leave-some-of-the-old-nute-waters-in-res-tank-when-filling-it-or-should-i-empty-it-completely-before.1028136/