When a clear snot forms on roots in a DWC, and the normal course of treatment for root disease doesn't work, you probably have something called brown slime algae, which actually isn't algae at all, but a cyanobacteria. It loves oxygen and doesn't need light to grow. It doesn't care if your res is chilled or not. Safe levels of H202 slows it a bit but doesn't cure it. It can show up for DWC growers for no apparent reason even after years of successful grows, tho one very common way to get it is to have it introduced by a clone from an infected garden. Having some sort of organic material in the res, especially a sugar based additive, also seems to be a common factor for those infected. Enzyme products like cannazyme feed this slime and cause it to explode. Once it shows up it's often a nightmare to get rid of. It WILL eventually spread to other DWC tubs, although it almost never gains a foothold on older well developed healthy plants/roots.
People who get this try the normal stuff... More bubbles in the water, cool res temps, and h202 treatments. Most of the time this does nothing at all. Most root disease will cause the ph to drop but the slime causes it to rise, which is one way you can figure out if you have it. It starts out subtle like a clear coating of mucus on the roots with no odor. Plants often still appear healthy for a while. In a very short time it will cover the entire root base and become thicker and sometimes turns yellow. Eventually it strangles the roots which causes pythium to set in, and at that point turns brown and finally has an odor.
The treatment is to sterilize the roots with a product like physan 20. Some people just let the plants sit in a really strong h2o2 bath for a few hours. Once the roots are cleaned up and sterile, you have two choices. You can try to run a continuous sterilizing product in the res, OR you can immediately try to inoculate the roots with beneficial microbes, which if done right will displace the slime and keep it at bay. Personally if it were me, and the clone wasnt anything special, I would toss it out, toss out the tub and net pot and anything else that can be easily replaced, and sterilize any testers or equipment that came into contact with the water.
You will find most of the information on this stuff from orchid growing forums and aquarium communities. Trying to sterilize the res is often a losing battle. In fact, since no hydro products kill this stuff, when you sterilize the water you are removing all competing microbes except this one. There are people who use RO filters and then run their water through a UV sterilizer and still end up with the slime. The answer always seems to be beneficial microbes.
Just be sure your nutes and additives are compatible with h202.Can anyone go thru the actual process when you add H202. Do you just add to your current res? Do you clean out and change the RO water (DI in my case) then add? Then add nutes? Greatly appreciated folks.
Most hydro sterilizing products actually work really well on everything but this slime.
Products that do nothing:
algaecide/algae destroyer from walmart/pet store
Sm-90
Dutch Master Zone (best at slowing it down)
Peroxide
Super oxy (any sort of oxidizing solution)
Roots Excelurator
Enzyme products (causes it to explode, like jet fule for the slime)
Products no one has tried specifically on the slime:
Zerotol - seems to be another oxy treatment
Watermax - From Bob's brew - prevents biofilm and scaley buildup
Hydro-fungicide - New product from AU - destroys microbes from the inside out
People who grow orchids and get this slime take care of it easily with a product called Physan 20. Cannabis growers use this product to eliminate existing slime, which it does very well, but no one has had the balls to run physan continously in the res for fear of losing their plants (it's stressful) and for fear of contaminating their bud with poison. The result is re-contamination.
What people do who successfully rid themselves of the slime:
Make a tea out of GH's ancient forrest amendment. Brewing a tea from this stuff gives you water with a greatly diverse and freshly active aerobic microbe community. Add a little aquashield and greatwhite powder to the tea mix for a really powerful brew. Feed the microbes a little molasses in the tea, but do not feed them once in the res. Add 2 or 3 cups to your initial res. Keep the tea in a fridge, it keeps for about 10 days, and replace the microbes by adding a cup to your res every few days. Do not add organic nutes, do not add bud sweeteners, the slime will come back. Do not add anything that kills off your bennies, such as spraying for mites and having the pesticide drip into the res, the slime will come back. Do not get lazy about keeping up your micro-army, the slime will come back. Some people add a few lava rocks to the res to give the bennies a place to live, so when changing the res the rocks can be used to inoculate the new water. Of course there is a specific way to make the tea, look up ACT or EWC tea for the method, but remember we only want the tea for the microbes, not for nutrients. So do not add kelp or other food that some recipes call for.
Some aquarium owners have found that if they leave their tanks sit for a few months, the slime seems to run it course and go away. Of course in hydro cultivation your plants would be dead long before that happens. However, some growers who have been plagued with this slime report that it does go away, seemingly on it's own, after a few months, while others are plagued for years, and still others have it come and go as it pleases.
Of course some people just say screw it and switch to drip to waste coco.
Hope this helps. I am no expert but I have been dealing with this stuff for about 8 months now and I have read every post and scrap of info I can find on it. Just wanting to pass it along. Props to all the growers who have experimented and researched this problem and provided us with this info.
I know I need knew buckets and all but this sucks! Im am pretty bummed. First time grow looking unbeleavable!! Oh well part of the learning process. ?? Do I kill all my plants (Flower and veg infected) or ride it out and take notes till they croke. Good luck all!!
Res temps above 68 will encourage major microbe growth. You can't have a res at 80 without some sort of protective measures or else you are sure to get root problems. The reason the slime came back thicker is because your sterilization killed off all competing organisms. You had the right idea, but the slime is tenacious. You probably did a good job at sterilizing your buckets and stuff, but even just a few spores from a ph tester or even the walls of the grow room are enough to reinfect. If you decide to scrap your veg plants, you can still take clones from them. In fact, my cutting always look better once they get separated from the infected plant, and they root just fine. Of course my bubble cloner hasn't produced one single clone since the slime showed up, but rockwool is unaffected. If you want a yield, you might consider putting clones in coco for now while you experiment with fighting the slime.2 days later snot slime is back, thicker. And the palnts haven't really grown in a week. Big fan leaves yellowing and curling with a burned look. I dont know what to do. It is just to hot. H20 temps are at 80-82 room temp like 88.
Several strains of Trichoderma have been developed as biocontrol agents against fungal diseases of plants. The various mechanisms include antibiosis, parasitism, inducing host-plant resistance, and competition. The biocontrol agent generally grows in its natural habitat on the root surface, and so affects root disease in particular, but can also be effective against foliar diseases.