UV Sterilizers for Freshwater and Saltwater Aquariums - Big Al's Pets

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24 Watt, for aquariums up to 100 gallons. UV sterilizer with power head helps keep aquarium water crystal clear, kills algae, pathogens and harmful bacteria.
I continue to follow the threads on forums, aquarium articles, and blogs about UV Sterilization.
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What size UV Sterilizer Should I get? UV Sterilizers are created in many different sizes from 8 watts to 240 watt for the aquarist, and even higher wattages for larger applications. What wattage to go with is decided by the size of the aquarium you plan to use it on. The unofficial rule of thumb in determining the wattage is 10 watts per 75 gallons water volume for saltwater application and 10 watts for every 150 gallons for freshwater closed systems. In pond application this is greatly increased to 10 watts per 1000 gallons, due to the suns natural capability of producing UV rays. It never hurts to get the next size up from the minimum to allow for bio-load, particles, and turbidity of the water. These factors affect the efficacy of the unit. • UV Sterilizers and bulbs are safe for freshwater, ponds, and saltwater aquariums;
Photo provided by FlickrTropic Marine Center Pond Advantage Professional UV Sterilizers for Ponds or aquariums
Photo provided by FlickrA MUST READ article for anyone looking to get the most out of their Aquarium or Pond UV Sterilizer!
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When using a UV Sterilizer in a home aquarium, the UV unit should be placed last in the filtration line. You want to first filter the aquarium water through your and then run the water through the UV device before returning the water to your fish tank. By first removing the solids in the aquarium water with your mechanical filter (canister filter, etc), you are helping your UV unit to attain maximum operational efficiency.The plus side to these submersible UV Pump/Filters is the need for no additional plumbing in aquariums or ponds, not that splicing a line for a TMC or Terminator UV is all that difficult (with ponds though, extra devices such as UVs can sometimes be a bit more of a plumbing project).

However the another entry into the field of Internal UVs are still incorrect as per their flow rate (& construction); The AquaTop UV Sterilizer Pump 3, 5, 7, & 9 watt are actually no better than the Submariner or similar early generation Internal UVs (please read more about these later in the article).When using a UV Sterilizer in a home aquarium, the UV unit should be placed last in the filtration line. You want to first filter the aquarium water through your and then run the water through the UV device before returning the water to your fish tank. By first removing the solids in the aquarium water with your mechanical filter (canister filter, etc), you are helping your UV unit to attain maximum operational efficiency.The AAP 13 Watt CUP-613 Pump/Filter Model performed well in initial tests, however the AAP 9 Watt UV CUP-609 Pump/Filter Model uses the same 528 gallons per hour manufacturer rated water pump as the 13 watt model which is generally too high for level 1 UV Sterilization.
HOWEVER later tests following adjustments made by AAP of this UV Sterilizer in configuration showed only a 160 gph flow rate in an aquarium in the vertical configuration which is appropriate for level 1 sterilization (9 times 25 = 225 gph or less).
Please note that these "correct flow rate" models are NOT sold on eBay, Amazon, etc., only by professional sellers such as AAP.

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First the Proprietary Heavy duty 13 watt and 9 watt UV Pump/Filter design with double O Rings seems to have solved the leakage/UVC short problem for the most part, and the flow pattern/design is also improved over earlier Submariner and similar models.

One negative is "rated" flow rate, however as per our tests this "rated" flow rate is not the actual flow rate; the actual/adjusted flow for certain proprietary units by AAP is much better for level one UV Sterilization.
The propeller design of the impeller has little head pressure which actually is better for maintaining a flow rate of 25 gph per watt in the vertical configuration.
However, the flow rate is not good enough for circulation of very large aquariums or ponds, so for this reason other circulation pumps should be utilized so and I advice to not depend upon these UV Pumps as the primary mode of circulation.As it turns out, this so-called "deal" for these UV Clarifiers is not so much of a deal when you go to replace the lamp/ballast @ $26.99 for the 9W or $39.99 for the 24W, not to mention these are NOT capable of true UV Sterilization which SHOULD BE the reason for purchase of such a product as often a cloudy or green aquarium is an indicator of poor maintenance such as too-high bio load, over feeding, poor filtration, etc.