Active Air-Timer

Marsoni

M251S

$123.59

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.

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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

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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

My husband loved these at first. Pros -easy to get on/off -stylish -comfortable -interior/exterior sole construction lasted longer than other more expensive shoes -price is great Cons -after less than a year the mouth of the shoe widened to a point where they slide off way too easy rendering them almost unwearable. -laces cannot be tightened

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Reviewed in the United States on February 9, 2026

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napoleon cruz

San Leandro, US

★★★★★ 5

Great !!

Size: 8, Color: Black/Black, Size: 8, Color: Black/Black

This item is awesome! Fits good & lightweight ! .

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Reviewed in the United States on June 3, 2026

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Larry

Birmingham, US

★★★★★ 5

Good value for the money.

Size: 9.5 Wide, Color: Beige

Comfortable right out of the box. Great style and well made. The more you wear the softer they get but maintain their overall appearance.

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Reviewed in the United States on May 25, 2026

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Amazon Customer

Dallas, US

★★★★★ 5

Very good quality for a reasonable price.

Size: 10, Color: Grey

Very good quality, very soft, very comfortable, look amazing, I’m very happy.

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Reviewed in the United States on May 23, 2026

Verified Purchase

Mike L.

Chelsea, US

★★★★★ 4

Comfortable fit for slip-in fabric shoes

Size: 14, Color: Black/Black

My first experience with Marc Joseph. I typically purchase dress and casual work shoes from Florsheim and occasionally Rockport. I'm giving these four stars because the initial fit and feel appear solid. Depending on the shoe brand I wear a size 14 or 15. My feet are slightly wide but I don't alway need wide fit. These size 14 fit well with wide enough toe box. I've tried slip in shoes before and they just don't feel right. These somehow work and there is no heel slip. My only reservation is the high lip on the heel for slip-in and hope they dont catch pant hems. I gave 4 stars because I'll have to determine durability. Granted they are a light fabric shoe with a soft rubber tread. I'd like them to last for at least 6 months..and use them for business casual work wear during warm weather.

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Reviewed in the United States on May 19, 2026