The glow is created by a natural process called bioluminescence. Certain molecules in the algae, particularly the enzyme luciferase and the substance luciferin, react to mechanical stimuli such as movement. This reaction releases energy in the form of blue light. It's a purely biological process that requires no electricity, batteries, or artificial additives.

After shipping, the algae need a few days to recover and resume their natural day-night rhythm (circadian rhythm). Glowing usually begins on the second day—but only during the night phase.

The algae glow whenever you move them in the dark, during the night phase. Even a slight twist or a quick shake is enough for them to begin glowing in their signature blue hue. During the day, the algae are dormant, but as soon as it gets dark, their nighttime magic begins.

In nature, bioluminescent microalgae such as Pyrocystis fusiformis use their glow as a defense mechanism. When exposed to movement, for example, due to predators or waves, they emit short flashes of light to irritate attackers or attract larger predators that could drive off the original attacker.

Since the algae continuously double in size with sufficient light and nutrients, the culture can theoretically be maintained indefinitely.

In practice, however, contamination by other microorganisms or competing algae species can occur over time, causing the original luminosity to gradually decrease.

With proper care, the glow often lasts for several weeks to several months. If your culture no longer glows or changes color, please contact us directly at contact@zealite.com – we'll be happy to help.

No, the algae contained are non-toxic and harmless to humans.

However, they are in a seawater nutrient medium that is not suitable for consumption.

Furthermore, this is a non-sterile culture. Therefore, we cannot guarantee that it is free from other microorganisms. These products are intended for observation purposes only.

The AlgaeTower is a compact indoor photobioreactor. A living culture of the microalgae Chlorella vulgaris circulates inside. With the help of light and gentle ventilation from a quiet air pump, the algae conduct photosynthesis. They absorb carbon dioxide from the environment and release oxygen, similar to plants, only in a more concentrated and controlled manner.

Yes, Chlorella vulgaris is one of the most efficient oxygen producers in the plant kingdom. Studies show that under optimal conditions, these microalgae can bind more carbon dioxide and produce more oxygen than any conventional houseplant. The AlgaeTower takes advantage of this property and offers an aesthetically pleasing and functional way to naturally improve indoor air quality.

The AlgaeTower is easily powered via the included USB-C cable.

Place it in a well-lit location, ideally near a window with indirect daylight or under a suitable LED light source. Direct sunlight should be avoided, as it can overheat the crop.

For optimal oxygen production, we recommend replacing approximately 20 to 30 percent of the liquid with fresh nutrient medium (water and AlgaeTower Nutrient Mix) every 2 to 4 weeks.

Even without refilling, the AlgaeTower will generally function smoothly for up to three months. After that, we recommend a thorough cleaning and, if necessary, the use of a refill kit to renew the culture.

No, the algae contained are non-toxic and harmless to humans.

However, they are in a freshwater culture medium that is not suitable for consumption.

Furthermore, this is a non-sterile culture. Therefore, we cannot guarantee that it is free from other microorganisms. These products are intended for observation purposes only.

Yes! Chlorella algae is also suitable as a natural food supplement for shrimp, filter feeders, and juvenile fish.

We currently ship within Switzerland and Germany. We are already working on expanding our shipping to other countries.

Yes, you can conveniently pay with TWINT. We also offer many other payment options, including Visa, Mastercard, American Express, Apple Pay, Google Pay, UnionPay, and PayPal.

The delivery time is usually 2-3 working days after receipt of payment.

Yes – all our algae come from sustainable laboratory cultivation in Switzerland. We rely on natural processes without chemicals or artificial additives.

Please send us a photo and a description of the damage to contact@zealite.com – we will arrange a replacement or refund.