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2. Lava filter - Wikipedia

   en.wikipedia.org/wiki/Lava_filter

   At present: 2 types of systems are used; constantly submerged lava filters (for treatment ponds, combined treatment ponds/irrigation reservoirs, ...) not-submerged lava filters (for wastewater treatment; wastewater is simply sprayed on the pebbles with this system) [2]

3. Expanded clay aggregate - Wikipedia

   en.wikipedia.org/wiki/Expanded_clay_aggregate

   Lightweight expanded clay aggregate (LECA) or expanded clay (exclay) is a lightweight aggregate made by heating clay to around 1,200 °C (2,190 °F) in a rotary kiln. The heating process causes gases trapped in the clay to expand, forming thousands of small bubbles and giving the material a porous structure.

4. Airstone - Wikipedia

   en.wikipedia.org/wiki/Airstone

   A spherical airstone at the Osaka Aquarium alongside a trio of red stingray pups, Hemitrygon akajei. An airstone, also called an aquarium bubbler, is a piece of aquarium furniture, traditionally a piece of limewood or porous stone, whose purpose is to gradually diffuse air into the tank, eliminating the noise and large bubbles of conventional air filtration systems, and providing other ...

5. Recirculating aquaculture system - Wikipedia

   en.wikipedia.org/wiki/Recirculating_aquaculture...

   Recirculating aquaculture systems (RAS) are used in home aquaria and for fish production where water exchange is limited and the use of biofiltration is required to reduce ammonia toxicity. [1] Other types of filtration and environmental control are often also necessary to maintain clean water and provide a suitable habitat for fish. [ 2 ]

6. Trickling filter - Wikipedia

   en.wikipedia.org/wiki/Trickling_filter

   Systems can be configured for single-pass use where the treated water is applied to the trickling filter once before being disposed of, or for multi-pass use where a portion of the treated water is cycled back and re-treated via a closed loop. Multi-pass systems result in higher treatment quality and assist in removing Total Nitrogen (TN ...

7. “Fish Torture Chamber”: Aquarium With Real Fish Created ...

   www.aol.com/fish-torture-chamber-aquarium-real...

   Bed-Stuy Goldfish Pond was reportedly hit at about 9 pm on August 26 when the vandal or vandals took colorful gravel and hand-painted stones and tossed around other decorations, killing about five ...