Pure condensate. Sounds like the same issue I had man yes it was veg.
I tried everything and I figured it out. Im sure it was a virus from the water.
I put 5ml per gallon of 3%... you can buy 29-32% and use it I think 1ml per gallon. you can use chlorine and bleach dutch master zone would probably work as well. but I prefer peroxide.
Let me know if you have any other questions and let us know how it goes.
I use 35% food grade peroxide. I think I paid $100 for 4 gallons 3 or 4 years ago.
Several places carry it online for pools and spas.