What is the recommended cfm? looking to aerate a 20000 gallon pool to raise ph.

A common rule of thumb is that you want to move the entire body of water every 24 hours (the air bubbles move the water). Your 20,000 gallon pool is roughly 2,700 cuft of water so you're going to want to move ~113cuft of water per hour or 1.9CFM. Bubble diffusers move about 4-6 times as much water as the air they produce so that would get you into the .3-.5 CFM range for your pump. That may seem quite small but there are other factors to consider; .3CFM to.5CFM is roughly what you'll need at the output of the diffuser so you'll need more than that at the pump. You'll need to overcome the pressure requirements of your pond depth (air volume halves as pressure doubles) and if your airline run is extremely long/small-diameter the friction of the airline comes in to play as well. The guideline above is just a starting point and since there are many additional minor factors to consider we would advise starting with a pump that delivers >1.5CFM and >3psi of pressure in free state (though there's no harm in going larger). We hope this helps and thank you for you interest. The Rootscape Team

Would this item do a bang up job in a 150 gallon pond with 25 fish at an average of 5 inches each,pond is 5x4 feet 10-17 in. deepwith a hakko 40pump?

I returned my aerator because it was too big for my 3200 gallon pond. They were wonderful about returning it. They said they were making a smaller version which I told them interested me.

What is the length of each of the 4 tubes?

Each of the four tubes are ~9" long. Thank you for your interest and please let us know if you have any additional questions. - Rootscape support

Is there a spot to tie a rope?

There’s no loop or eyelet to attach a rope. However, you could tie a rope around the base

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💧 Elevate your pond’s vibe with effortless, year-round clarity!

WINTER PROOF YOUR POND - Durable materials prevent ice buildup and fish kill, keeping your ecosystem thriving year-round.
SMART PROTECTION BUILT IN - Integrated check valve safeguards your pump and diffuser system from damage.
STAY SUBMERGED STAY STABLE - Self-weighted base with 25% extra ballast keeps diffuser perfectly upright on pond floors.
EFFORTLESS NO ASSEMBLY SETUP - Out-of-the-box ready—plug in and oxygenate in minutes, no tools or fuss required.
CONSISTENT OXYGEN FLOW ALWAYS - Unique anti-clog design ensures steady bubbles for years of reliable pond health.

The Rootscape Large Pond Aerator and Bubbler is a premium sinking air diffuser designed for professional-grade pond filtration and algae control. Featuring a self-cleaning anti-clog design, a 25% heavier ballast base for stability, and integrated check valve protection, it ensures consistent oxygenation and water circulation. Built to operate year-round, it prevents ice buildup and fish kill, making it an essential tool for maintaining crystal-clear, healthy ponds with minimal maintenance.

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Brand	Rootscape
Material	Plastic
Colour	White Air Diffuser
Item Weight	2.3 Pounds
Nominal Wall Thickness	0.125 inches
Outside Diameter	0.38 Inches
Item Length	0.38 Inches
UPC	689353600787
Manufacturer	Rootscape
Specific Uses For Product	Pond Maintenance, Winter Care
Item model number	AD413
ASIN	B078RHKJMW

Rootscape Rootscape Large Pond Aerator and Bubbler - Sinking Air Diffuser for Filtration and Algae Control

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