Holds 2 liters Impact-resistant design Hangs on a tank or in its stand Simply put, this is the best brine shrimp hatchery on the market. You may be thinking, "How much better could this be over a 2-liter bottle?" When you hatch live baby brine shrimp every day, the construction and thoughtfulness of this design won't go unnoticed. All of us at Aquarium Co-Op use and love this hatchery. It is made of super strong plastic to withstand an impact and has the option to run a heater and thermometer in it. We highly recommend running this brine shrimp hatchery with our USB Air Pump, airline tubing, Aquarium Co-Op Brine Shrimp Eggs, and Easy Brine Shrimp Salt.  (Note that the provided thermometer is in Celsius.)  Note: The height of the hatchery with the stand is about 12.75 inches (32.3 cm), and the height of the hatchery with the stand and height extenders is about 16.5 inches (42 cm). The extra height beneath the hatchery gives you extra room to open the valve when draining out the baby brine shrimp. The hatchery kit comes with:– Hatchery with needle-type valve– Hatchery lid– Hatchery stand– Height extenders for the stand (2)– Thermometer (measures in Celsius) with o-ring– Rigid airline tubing– Pipette– Air stone (please note that the air stone may be different than what is pictured)– Air valve Kit does not include brine shrimp eggs, measuring spoon, air pump, heater, or other equipment. Instructions for Hatching Brine Shrimp:1. Fill to within 1 inch from the top with water (no dechlorinator).2. Add 2 tablespoons of salt (we recommend saltwater marine salt, like Easy Brine Shrimp Salt).3. Add up to 1 tablespoon of eggs.4. Let hatch for 24 hours (or more depending on temperature).5. Use a light near the spout to attract brine shrimp for collecting.6. You can rinse the brine shrimp or feed with the salt water if your tank needs minerals for the live plants or hard water fish. We don't use the provided air stone in our setup as it makes cleaning harder between hatches. If you wish to use the air stone, you'll need to cut down the rigid tubing. We recommend cleaning by rinsing out well after every use while it's still wet from the previous hatch.