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Active Air-Timer

Marsoni M251S
Sale price$123.59
Pay 4 payments of $30.90 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
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.
Easy Shipping

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.

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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
4.5 ★★★★★
Based on 865 reviews
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Product Reviews
L
Verified Purchase
Linda Cassidy
Chelsea, US
★★★★★ 3
Summer Slides
Size: 1 Big Kid, Color: Lilac/Glitter
-Slide is sturdy and well made; -Color is very attractive and true to size; -My Granddaughter loves them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 31, 2024
D
Verified Purchase
Dayami
Grantham, US
★★★★★ 4
Size
Size: 3 Big Kid, Color: Black/Beige
Comprar un size más grande de los que usan
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2025
Y
Verified Purchase
Yulieskyvazquez
Belleville, US
★★★★★ 5
El size se ajusta a la medida
Size: 12 Little Kid, Color: Pearly Beige
Bellos a mi niña le encantaron buena calidad
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 6, 2026
E
Verified Purchase
Esperança Eunice
Lexington, US
★★★★★ 5
Great
Melissa doesn't disappoint, I love the smell.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 13, 2026
D
Verified Purchase
Douglas
Fort Morgan, US
★★★★★ 5
Worth the money.
Size: 8 Toddler, Color: Glitter Pink
Expensive but precious and good quality.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 27, 2026

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