root help

Hey everyone, I've been using the tea with amazing success for 1.5 years in my under current 6 xl x 2 . Sad to say I ran into a Huge root problem. Weird thing is first 3 weeks of flower trees look amazing and slowly roots would just go brown and mushy. Can't wrap my head around it because ive been using the same dose with great success here are some pics.
The water smells normal and is crystal clear I am completely stumped to what is causing it , no slime visual nothing just dying roots.

tea recipe is 1 cup ewc 1.25 ml sub culture m/ 2.5ml sub culture b in 2 gallons of water. this recipe ive had success with for 1.5 years. always bubbled 48 hours at 75f edit: 15ml molasses

fresh res 8 cups of tea to 33 gallons of water and 3 cups every 3 days
res temps 72f
room temp 80f
nutrient gh micro bloom calmag only. nothing else
4000 watt
2 x uc 6xl
tap water ppm 30 left sitting 24 hours

also side note is while the roots are browning and dying there are also very clear white roots growing really is a odd problem I'm having, the picture is how the roots start and always end up dying last couple crops

Any help is really appreciated thx!

Im not a hydro grower but im curious so hopefully youll entertain my questions

You have successfully grown out plants using this same tea?

Wondering what could have changed,sounds like you had it dialed in.

Maybe recently your water supply changed?

Yeah exact same tea nothing has changed, I haven't had root problems since starting tea a while ago. Heres a pic of an old crop nothing special but it was successful.

only thing i can possibly think of is maybe molasses isn't completely consumed and its going in the res but i bubble for 48 hours

What kind of water are you running?

tap water with 30 ppm, i live in canada with very clean drinking water, been using tap water from start no issues before till now

Maybe they recently added something and its killing your microbes.

Just a thought,but like I said I was curious.I wish you luck with this problem,wish I could help more but im just not up on my hydro.merry christmas

the thing is, i veg in totes and the roots are pearly white and perfect, if its the tap water i shouldn't be able to veg let alone flower for 3 weeks before it happens.
I also leave the water sitting 24 hours or more just in case of chlorine and it wouldnt explain the first 3 weeks smooth sailing. this is a very confusing problem considering how bullet proof the tea was up until now.

What are you doing to oxygenate the water?

Res temperatures?

I have alita 80 for one system and airforce 40 for the other, i think both are more than enough for 33 gallon res
each, res temps never went above 72f which suppose to be good spot for bennies and dissolved oxygen.
water change every week.
Been using 8 cups tea per system every water change then 3 cups every 3 days, thats more than maintenance dosage and also less than fighting slime dose which i see none of.
no signs of slime/smell/anything. Just dying roots with but next to the dying roots there are new bright white healthy roots. The last time this happened i tried to ride it out but the trees just
stop eating and slowly died the new white roots wasn't enough to carry on.

Hmm I'm not too sure what to say. I know that flower will be the true test for the CX Hydroponics Wilt Guard I am using, but so far it cured root rot on one plant that I later cloned and rooted and am currently growing (4 weeks about into veg) with no signs of the pyth emerging. My res temps are less than ideal and sometimes jump into 72-73* range but most of the time are about 68-69*. I am using bennies as well but I don't make tea's. Maybe give that a try? My local hydro shop owner offers full money back guarantee on it and so far, I have a lot of faith in it.

Root aphids? do you have severed roots with black ends? Or gnat larvae eating the roots in the pots (hard to tell until you cut roots out at the end) . I run colder water, never above 64. The severed roots rot inside the other root mass, causing further rot and maybe pythium. Empty and clean your res. Do double strength roots (periodic) get the nematodes or the admire(root aphid) and ritomil to solve the pythium if you have it.
I think this system is problem prone and i have gone through the same thing, sudden yellowing, twisted leaves and chunks of roots dying off. I also find the system grows less potent bud, with less aroma. Flowers are not as dense as soil.

Root aphids will give you root rot in dwc very fast. Only thing would be to get rid of the aphids but that's hard