Beneficial Bacteria


I have been trying for quite sometime to determine weather or not using beneficial bacteria in a DWC system is beneficial or not. There is a ton of info either way on this, and nothing to help me come to a conclusion. Does anyone here have info in regards to beneficial bacteria and fungus in a DWC system? I would love to hear your thumbs or down, and your reasoning for it. I am a big info guys, so your why’s are almost more important that your answer. Thanks everyone.


Hey there, @thepowersurge! Great question! I would suggest a thumbs down on using bacteria in DWC. You are inviting issues (i.e. pythium, algae, etc) with an already sensitive system. Generally, the use of beneficial bacteria is recommended for soil or coco. I’d love to hear other members’ thoughts on this.

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You can use a microbe tea. Make about 5 gallons (depending on how big the roots/plants are). Dip your dwc roots in that bucket and repeat every 3 days. Thats the only way I know of, organically, to keep a sterile dwc.

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I have been using hydroguard for the past two years and have just recently starting using another beneficial bacterial strain that is different than hydroguard but it’s advertised to do the same things from a company called clear pond, I have had zero negative effects from using it in DWC.

Possibly but pythium is an anaerobic bacteria and I believe most beneficial bacteria is all aerobic bacteria which lives in highly oxygenated environments and was under the understanding that this type of bacteria is not biologically harmful and that these certain strains found in hydroguard and clear pond is a specific type that feed off of anaerobic bacteria making them “search and destroy” other bacteria like pythium.

This is just what I was taught but it’s not like I learned this information in science class or anything so I could be wrong lol


imo, you can run a sterile reservoir, adding 3% hydrogen peroxide regularly to kill all bacteria, good and bad…or, since microbes and bacteria will grow in the reservoir and along side the roots, better to implant good, beneficial bacteria to occupy that space and the stronger their colony, the less likely bad stuff will get a foothold.


I ran Hydroguard when I did DWC without any issues in my reservoirs. I stopped using it consistently when I switched to ebb and flow - I put it in on reservoir changes but not top offs, so I introduce it into my reservoir every three weeks or so.