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🌱 Defend your garden with the power of clean, green disease control!
BioSafe Systems ZeroTol HC is a powerful, broad-spectrum algaecide, bactericide, and fungicide formulated with peroxyacetic acid and hydrogen peroxide. OMRI-listed for organic use, it kills plant pathogens on contact without harmful residues or harsh chemicals. Ideal for home gardens, hydroponics, and greenhouses, it promotes healthier plants while sanitizing surfaces to reduce disease spread.





| ASIN | B08XDPT2JR |
| Best Sellers Rank | #27,445 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #672 in Pest Repellents |
| Brand | BioSafe Systems |
| Customer Reviews | 4.3 4.3 out of 5 stars (98) |
| Item Form | Spray |
| Item Weight | 1 pounds |
| Item model number | SINGLE 6200-1 |
| Liquid Volume | 1 |
| Manufacturer | BioSafe Systems |
| Product Dimensions | 7 x 5 x 11 inches |
| Target Species | Fungus |
| UPC | 188716000931 810075190045 |
A**N
Highly effective, great product, does exactly as it states
This is flat out the best product for bud rot in my opinion, and I've tried several different things and products and fixes. Make sure to wear mask and glasses if it's windy at all. Use 5 tsp per gal of water and soak it down (I use a pump sprayer) once every 5 days if you see it or have a problem, you can also use it as a preventative measure too. Great product, can't stress that enough saved me a ton of flower!
O**.
Powerdery Mildew is a nightmare once you get it. ZeroTol is the answer.
This stuff is exactly what I needed. Got a nasty Powdery Mildew breakout this past summer in both my grow tents due to the humidity and my own laziness/ignorance. So I killed off a bunch of fully grow plants and sprayed whole tents down with bleach. And of course the PM came back in the next crop, so I killed more plants off. But this time I did some research online grow forums and with ChatGPT to find the answers. This stuff is safe to use directly on plants and will kill the PM. I found myself cleaning the shower mildew with it too. Works great!
T**E
Worth every dime
Absolutely swear habit. But be careful and always always always wear proper ppe when handling. Eye protection, skin, gloves, sjoe covers. The whole 10 yards. This stuff is nasty on the bad stuff and also 10x as bad on your skin. It's highly concentrated so a respirator might be handy. Follow mic rates properly and don't spray to hard or heavy. You can spray up until harvest w great results. But I recommend a preventative program
S**P
Good product but false advertising?
I ordered the 1 gallon, Case of 4 and only received 1 gallon. Zerotol is a great product and because I already know I like the product, I didn't read the reviews until after I placed the order. I wish I had read them first because it seems I am not the only one to receive only 1 gallon when it says Case of 4. I can not find any way to contact the seller for this item. So I can only leave a one star review which I don't like to do for a good product.
G**D
Highly Effective control solution
This product effectively combats a variety of pathogens, including powdery mildew, botrytis, pythium, and fusarium. It can be used on ornamentals, vegetables, herbs, and even turf. ZeroTol HC is versatile, suitable for foliar sprays, hydroponic systems, and surface disinfection.
D**S
Instructions? Application rates?
Heard great things about this product but feel like I have to research before I can use.
D**L
Easy to use; note that this is concentrated
This is used in greenhouses. It works exactly as indicated on the label. Note that this is concentrated, so if treating a small area, you will need the ability to measure out 10-30 ml to mix in a small sprayer.
M**Y
I wouldn’t recommend it for small in house hydroponics
The product works well, but it was hard to get everything right for use in my hydro systems. This product would be better suited to use in gardens or farms. It was worth a try for controlling the fungus gnats.
Trustpilot
2 weeks ago
2 days ago