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2. Substrate (aquarium) - Wikipedia

   en.wikipedia.org/wiki/Substrate_(aquarium)

   For freshwater aquaria, gravel is the most common substrate. To prevent damage to fish, gravel should not be sharp. Aquarium gravel can be as coarse as pea-sized or as fine as 1–2 mm. [1] It is available in a number of colors, and may be naturally colored or dyed, and may have a polymer seal to ensure it does not affect water chemistry. [1]

3. Deep sand bed - Wikipedia

   en.wikipedia.org/wiki/Deep_sand_bed

   A deep sand bed is [1] a filtration method used in some saltwater aquariums and some freshwater aquariums. A deep sand bed, similar to the Berlin Method, is designed to cultivate anaerobic bacteria in the bottom layers of sand, converting nitrate to nitrogen gas to remove toxic nitrates.

4. Aquarium filter - Wikipedia

   en.wikipedia.org/wiki/Aquarium_filter

   Prefiltered water is delivered to a perforated plate (drip plate). Prefiltering may take place in the aquarium via a foam block or sleeve in the overflow, or weir siphon, or it may be prefiltered by filter wool resting on the perforated plate. The waste laden water from the aquarium spreads over the drip plate, and rains down through a medium.

5. Water filter - Wikipedia

   en.wikipedia.org/wiki/Water_filter

   An intermittent slow sand filter was constructed and operated at Lawrence, Massachusetts in 1893 due to continuing typhoid fever epidemics caused by sewage contamination of the water supply. [19] The first continuously operating slow sand filter was designed by Allen Hazen for the city of Albany, New York in 1897. [20]

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. Backwashing (water treatment) - Wikipedia

   en.wikipedia.org/wiki/Backwashing_(water_treatment)

   In some applications, air and water streams are simultaneously pushed upwards through the granular media followed by a rinse water wash. [3]: 213–4 Backwashing continues for a fixed time, or until the turbidity of the backwash water is below an established value. At the end of the backwash cycle, the upward flow of water is terminated and the ...

8. Can I use sand as cat litter? We asked a vet to find out! - AOL

   www.aol.com/sand-cat-litter-asked-vet-120000565.html

   Avoid builder’s sand or sand from unknown outdoor sources, as they can pose health risks. Always store sand in a clean, dry place to prevent contamination before use. Other cat litter alternatives

9. How to hit on someone in real life – without being a creep

   www.aol.com/hit-someone-real-life-without...

   James Preece, dating coach. In some cases, depending on where you are, it can also be helpful to use your surroundings. “This is particularly easy if there is something obviously going wrong ...