Best thing I ever Don't add to my res are 99% of the biologically derived products on the market. Seriously, I don't change my DWC res through the entire flower run and don't run sterile. It's clear and there's no need.
DO's with Hydro
- Use r/o filtered water, or water which is just as clean of mineral and **biological** material
- Use only this water with all cleaning, meters and other equipment touching your solution
- Maintain enough O2, and less than needed for pH changes
- Keep temps between 65-69F
Years of doing this now, in multiple states of the US. If your problem is in the air where you live, I would suggest proven beneficial enzymes, or possibly worm casting tea. I haven't needed any. I did fight bacteria/algae coming from my well water, contaminating equipment which was washed/rinsed with it. Once the system was sterilized and only r/o water used, there were no issues.
Thank you for the information Keep_goin, I'll remember it for the future for sure. Definitely going to be helpful to a lot of growers.