★★★★★ 5
Worth the buy!
Color: Upgrade Silver, Size: Rechargeable
Great product!
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Reviewed in the United States on May 13, 2026
Active Air-TimerDeliver growth boosting CO2 with our user friendly, easy to operate system. With its programmable timer, it will automatically maintain ideal CO2 levels for optimum growth. For small to medium size areas, select the COSYS; for larger than 10' x 10' areas, select the COSYS20. To use Hydrofarm's CO2 Flow Rate Calculator, click HERE NOTE: Current COSYS & COSYS20 now come equipped with a black rubber O ring that has replaced the white plastic washer.
Quick Dispatch:
Your Active Air-Timer orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
Order Tracking:
You'll receive a tracking link by email once your Active Air-Timer ships.
Need Help?
Questions about Active Air-Timer, sizing, or delivery? We're just an email away.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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4.0 ★★★★★
Based on 424 reviews
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Product Reviews
★★★★★ 3
Mediocre salt and pepper grinders
Color: Upgrade Silver, Size: Rechargeable
Pros: They do work, and they are rechargeable.
Cons: the motors run really slow, capacity is low, The charging tray you have to empty frequentlyto reduce buildup underneath the salt and pepper grinders.
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Reviewed in the United States on March 3, 2026
★★★★★ 5
Sleek and classy
Color: Upgrade Silver, Size: Rechargeable
I love that these are rechargeable
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Reviewed in the United States on April 25, 2026
★★★★★ 5
Excellent Pepper Grinder
Color: Upgrade Black, Size: Rechargeable
I've had several pepper grinders over the years, and none was as easy and smooth to use as this one. It fills easily, and it grinds evenly and smoothly with a gentle press of the button. I am glad there are two, just in case one does give out, I will have the other to use, as I am not interested in grinding salt. It runs so effortlessly that you have to be a little careful when picking it up that you do not accidentally engage the button before you want the pepper to come out. I love it, and came back here after using it for two months just to let you know.
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Reviewed in the United States on April 26, 2026
★★★★★ 5
Greatest Kitchen Item I've Bought in Years
Color: Upgrade Black, Size: Rechargeable
These grinders are awesome. No more tedious grinding, or endless shaking! I love the adjustable grind levels (I like mine fairly coarse), and these hold a charge for a long time - months. My friends are super impressed when they visit, and will probably be buying these too.
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Reviewed in the United States on May 23, 2026
