Could this system be used on a rain barrel system?

I don't think so. A rain barrel is usually 50 to 75 gallons . My bell siphons start in a tank of more than 100 gallons. My larger are 250 plus gallons. The siphons are sometime difficult to start. A larger tamk would be better for the bell siphon

What size pump/gph would you recommend using for the siphon to work good on a ibc tote?

I use an 800 to 1000 gal. per hour pump.

What is adjustable on this siphon? is the 12" relating to the entire depth of the cut off top part of the ibc tote?

The 2 rings you see in the photo will raise the water depth by 1/2" and 1" for starting seeds, planting seedlings and combined it will flood above the media to drive out bugs as stated in the description. As to your second question as stated in the description I cut the siphons based upon MEDIA depth so if you are filling your IBC right up to the brim with media then yes but most people leave an inch or so of IBC above the media. I personally leave about 2" so I can flood the grow bed without any spills. Media of course refers to the gravel, river rock, clay balls, etc. I don't care how deep your IBC is but rather how deep your MEDIA is. The siphon is designed to keep the system water below the media surface so you won't grow algae. I am being pressured to write a book on Aquaponics 101 I can tell. When I get time I will but meanwhile please investigate all the great primers that are already out there before you design your system or purchase pieces parts.

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Aquaponics Bell Siphon Kit for IBC Growbed 12" Media: Easily Adjustable! Over 20,000 Siphons Sold Worldwide So Buy with Confidence!

Product ID: 23441445

Details

Color
White
Material
Polyvinyl
Planter Form
Raised Bed
Special Feature
UV Resistant
Style
Modern

🔧Adjustable water level with easy-turn rings

⚙️2-1 Bernoulli effect ratio for rapid siphon start

🛡️4" rugged gravel guard saves grow space

¥25289

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Elevate your aquaponics game with the ultimate bell siphon kit—grow smarter, not harder!

MAINTENANCE MADE EFFORTLESS - Rotate the gravel guard monthly and enjoy clog-free, noiseless operation—no traps or snorkels needed.
DURABLE THIN WALLED PVC BUILD - Lightweight yet robust materials ensure easy installation and long-lasting performance.
SPACE SAVING 4 GRAVEL SHIELD - Maximize your grow bed with a durable, rotatable guard that blocks root intrusion without wasting space.
PRECISION 2 1 BERNOULLI DESIGN - Engineered for lightning-fast siphon activation and flawless stops every cycle.
PROVEN RELIABILITY WITH 20 000 SOLD - Join thousands of aquaponics pros who trust this kit for consistent, trouble-free water flow.

The Aquaponics Bell Siphon Kit for 12" IBC grow beds features a patented 2-1 Bernoulli funnel design for rapid, reliable siphoning without traps or snorkels. Its rugged 4" gravel guard maximizes grow space and prevents root clogging with easy monthly rotation. Made from durable, thin-walled PVC, this kit includes all necessary adapters and pipes for quick setup and adjustable water levels. With over 20,000 units sold worldwide since 2012, it’s a proven, low-maintenance solution trusted by aquaponics enthusiasts and professionals alike.

Specifications

ASIN	B01AGZT5WM
Best Sellers Rank	#497,540 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #24,621 in Gardening Pots, Planters & Accessories
Brand Name	Generic
Color	White
Customer Reviews	4.6 4.6 out of 5 stars (74)
Finish Types	Semi-Gloss
Included Components	90 Degree Pipes, Adapter, PVC Pipes, Threaded Adapters, Water Level Extenders
Indoor Outdoor Usage	Outdoor
Item Weight	200 pounds
Material Type	Polyvinyl Chloride (PVC)
Number of Pieces	14
Other Special Features of the Product	UV Resistant
Planter Form	Raised Bed
Product Style	Modern
Shape	Round
Size	12" Media
Unit Count	1 Count

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¥25289

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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