Maxi 35 mm EM ceramic tube - 2 tubes

Our product page recommends 1 Maxi Tube per 132 gallons (500 liters) in a rain barrel or a pipe, and use in aquariums of up to 39.6 gallons (150 liters). For a toilet, 1 tube in the tank is enough. So for a 264-gallon (1,000-liter) tank, you'll need both tubes in the set.

No. The Maxi Tubes are not an approved water treatment system: rainwater from a rain barrel is still non-potable water, with or without the tubes. The manufacturer markets them for maintaining water tanks and pipes, especially against odors and buildup, though no independent study has demonstrated these effects to date. They are meant to be used as a supplement and do not replace a filter.

Before first use, soak the EM Maxi Tubes overnight in clean water, then place them in boiling water for 10 minutes. Repeat this routine every 3 to 4 weeks.

In between, rinse them regularly with clean water, or leave them overnight in undiluted EM Clean. A greenish film may form in water exposed to light. A quick scrub with a brush is all it takes.

The EM Maxi Tubes are made to last 10 years: the Kibushi clay is fired at 2,192 °F (1,200 °C), which makes them very sturdy. Replace a tube if it's cracked or broken; the old one can then go in your garden. Like all our products, they come with the 2-year Moutta Farm warranty.