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2. These are the best Walmart deals to shop this week - AOL

   www.aol.com/lifestyle/the-25-best-walmart-deals...

   There are tons of deals to shop this week, including $230 off a cordless vacuum, a 65-inch Samsung TV for under $400, and a Drew Barrymore collection slow cooker for just $50.

3. Hydroponics - Wikipedia

   en.wikipedia.org/wiki/Hydroponics

   The same type that is used in aquariums, though any small gravel can be used, provided it is washed first. Indeed, plants growing in a typical traditional gravel filter bed, with water circulated using electric powerhead pumps, are in effect being grown using gravel hydroponics, also termed "nutriculture".

4. Aquarium filter - Wikipedia

   en.wikipedia.org/wiki/Aquarium_filter

   The pump should only be powerful enough to push the water through the filtering material as well as overcome the drag in the intake and return pipes. This makes canister filter pumps virtually insensitive to the height difference between the aquarium and the filter (although exceeding the manufacturer-specified height limit can lead to leaks).

5. This bestselling 'lightweight but sturdy' Shark vacuum is ...

   www.aol.com/lifestyle/this-bestselling...

   Walmart's amazing sale on the Shark Navigator has the vacuum marked down to just $97, which means it's over half off its usual price — we haven't seen this fan-favorite cleaner this low in ...

6. Sand filter - Wikipedia

   en.wikipedia.org/wiki/Sand_filter

   In addition, there are passive and active devices for causing solid-liquid separation such as settling tanks, self-cleaning screen filters, hydrocyclones and centrifuges. [4] There are several kinds of depth filters, some employing fibrous material and others employing granular materials. Sand bed filters are an example of a granular loose ...

7. Cleaner fish - Wikipedia

   en.wikipedia.org/wiki/Cleaner_fish

   Cleaning stations are a strategy used by some cleaner fish where clients congregate and perform specific movements to attract the attention of the cleaner fish. Cleaning stations are usually associated with unique topological features, such as those seen in coral reefs [ 1 ] and allow a space where cleaners have no risk of predation from larger ...