★★★★★ 5
go o o o o
Format: Paperback
go o o o o d
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Reviewed in the United States on October 21, 2014
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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4.6 ★★★★★
Based on 516 reviews
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Product Reviews
★★★★★ 1
One Star
Format: Paperback
Exactly the same as the free PDF I downloaded online for my student, only this costs $26 plus tax.
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Reviewed in the United States on April 3, 2017
★★★★★ 5
Excellent customer service
Format: Paperback
Totally recommendable.
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Reviewed in the United States on August 26, 2019
★★★★★ 5
Five Stars
Format: Paperback
This helped a lot for us to prepare for the SLATE exam.
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Reviewed in the United States on August 23, 2016
★★★★★ 5
Good
Format: Paperback
This is great! I like this one.
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Reviewed in the United States on June 22, 2016
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