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Gulfstream Tropical AGU00528 Ista Max Mix Co2 Reactor for Aquarium, Medium

3.9 out of 5 stars 31 customer reviews
| 6 answered questions

Price: $14.41 & FREE Shipping on orders over $49. Details
Only 17 left in stock (more on the way).
Ships from and sold by Amazon.com. Gift-wrap available.
  • The most efficient application of co2 dissolution
  • Compact in size and can be used either internally or externally
  • Durable to acidity and impact resistant
8 new from $7.09

$14.41 & FREE Shipping on orders over $49. Details Only 17 left in stock (more on the way). Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • Gulfstream Tropical AGU00528 Ista Max Mix Co2 Reactor for Aquarium, Medium
  • +
  • AQUATEK CO2-Proof Tubing 16 Feet
  • +
  • Fluval 88g-CO2 Bubble Counter - 3.1 Ounces
Total price: $27.79
Buy the selected items together


Product Description

Best way to diffuse the co2 into planted tanks. There is no co2 loss in this system. Inside the reactor, the co2 bubbles are broken down constantly until they´re completely dissolved into the water. When using regular (ceramic plates) diffusers, there is loss when the co2 bubbles reach the water surface.

Product Details

  • Item Weight: 0.3 ounces
  • Shipping Weight: 8 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B005DGJDXQ
  • Item model number: 528
  • Average Customer Review: 3.9 out of 5 stars  See all reviews (31 customer reviews)
  • Amazon Best Sellers Rank: #67,147 in Pet Supplies (See Top 100 in Pet Supplies)

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Verified Purchase
I'm using two of these on two different tanks and have no problems with either of them. I've heard some people complain that they are noisy, but mine aren't. It will make some noise if it's not full of water like it is supposed to be, but if you disconnect the co2 tubing for a second it will top itself off.
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Verified Purchase
This unit works excellent, and dissolves the CO2 100%. I'd give it 5 stars but had to add my own hose clamps as the pressure fittings supplied leaked. I have no doubt that if only using the enclosed pressure fittings, after heating up you'd come home to a separated hose, empty tank, and flooding. Our planted tank is 70 gallons with a 5# CO2 tank with Aquatec Premium regulator. This reactor complement the setup very well.

One other thing is make sure that the unit is supported. Its weight when full with water will pull down, and kink the hose.

I'd defiantly purchase this again but use clamps!
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Verified Purchase
I'm giving this a 4-star rating because the product needs finishing. If set up right out of the box the little needle wheels inside will seize up and quite spinning. One must dismantle the unit and file down all plastic extrusion remnants on the inside tube (that the impellers ride) as well as smooth out the inside surfaces of the center hole on both impellers. Doing so will keep this unit from binding up and coming to a stop, ever.

This little reactor works great once the above issues are taken care of. Mixes well and since it is semi clear, one can peer in and see how efficient your co2 is being disolved. This helps in fine tuning the bubble rate for any one tank.

I run my Mix Max in-line directly after my Rapids mini canister which runs (apparently) at 80gph, which is probably more like 65-70gph. At this flow rate I get very few bubbles that make it out of the reactir and into the main tank.

Love this product! Perfect for nano tanks.
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Verified Purchase
When I took it out of the box I noticed a vertical crack of about 3 inches long. The crack didn't go all the way through so I kept it, and so far it is working without leaks. I would have sent it back but I needed to get my CO2 going. The unit comes with a number of adapters for different size hoses and I had to use a couple of them with my eheim hoses. I did experience a leak on the top connector because the hose, even with the adapter, isn't as tight as it should be. Next trip to the hardware store I'm getting some hose clamps for added safety. As for function, it works perfectly. I can't hear it running but it spins constantly and my drop checker says I'm getting good CO2, plus my plants are pearling regularly. My reactor is seated at a 20-30 degree angle because I haven't been able to keep the suction cups secure and the stiff hoses put enough pressure on it to shift it. I gave up trying to keep it totally vertical and it hasn't had any effect that I can find.

Overall, I'm happy with this reactor but be sure to check it closely when it arrives and consider the addition of hose clamps.
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Verified Purchase
Complete waste of money.

1st - It greatly reduces the flow coming out of the pump. I have two return pumps on my tank and put this on one. It more than half cut the outflow of that pump. This really needs its own dedicated pump and not a sump return pump.

2nd - I have a CO2 tank on a solenoid and it is on when the lights are on. Even with 1 bubble/second or even 1 bubble every couple of seconds, this thing will continually fill with CO2 to the point that the water level in the contraption lowers so the paddle wheel is completely in CO2. The idea is that the pump injects water into this and turns a paddle wheel. The paddle wheel mixes the water and CO2 which is flowing in from the top. The CO2 rich water then moves down and into a return tube at the bottom which directs it back up to the top of the device and into the tank. Once the water level dropped below the wheel, it stopped mixing CO2 and water.
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Verified Purchase
AWSOME i have two these are Ideal for larger tanks and really simple to figure out how to use... I did not do mine line but i got a Rio pump instead and it works great must try its in the tan and makes a decent current as well... if you have a 55 or better get one!
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Verified Purchase
Unfortunately, this cut down the flow of my 285GPH by about half on my 30g Sea Clear Show. I then ordered a new 500-something GPH pump and it cut it down by about half. The blades do not spin after verifying they do not touch the sides. After purging the air mine was silent though. I'm returning it.

To sum it up it strains your pump pretty bad and decreases efficiency overall by a lot. I made a reaction chamber out of a seachem media bottle, two barb fittings, co2 proof airline going in so I can place an airstone on the end and held the fittings in with waterweld and clear silicone. Now my pump flow is normal, I'm diffusing at a great rate and I did it for about 50c.
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Verified Purchase
I bought this after trying out a GLA inline atomizer. The inline atomizer developed a crack and the manufacturer ignored my repeated attempts at contact. This product is well made, but will require additional hose clamps to secure the hoses. Simple design, but very efficient. Makes a bit of sound, but not too bad. I'd recommend checking out youtube for installation videos.
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