The drop-in chiller is the simplest to install, because it consists of a Fitness Health Keto coil which is placed in the sump of the aquarium or in the wet/dry filter. The coil is made of titanium and filled with refrigerant, and then sealed so it is waterproof. This coil is connected to the unit's compressor by a thermostat. Drop-in chiller sizes range from 1/5 to 1/3 horsepower. The drop-in chiller is used mainly by aquarists with saltwater reef aquariums. Because no plumbing is involved, the drop-in chiller works very well for systems that don't have lots of room for accessories.
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https://pillsfect.com/fitness-health-keto/