Green Killing Machine Internal 9 Watt UV Sterilizer with Power Head

I was happy with this unit, seemed like a sane and useful design, however it failed at around 4 weeks of operation. If I am able to get warranty service, or otherwise the issue resolved I'll update this review but right now I can't recommend it.

At 4 weeks or so the control box red light went out which should indicate the UV lamp needed replacing. That's terrible but I wondered if that might not be just a defective light, etc. I just went ahead and purchased a new lamp, figured I'd use it in the long run regardless, however the control box indicator light is still out so that's not it, apparently the 'control box' has failed. I'm attempting to get warranty service from the manufacturer because I'm over the 30 day return policy.

I took a chance on a relatively new vendor and I'm glad I did. Hats off to the Umbrella Group. Everything went smoothly and the product was delivered in good shape and on time.

I'm very pleased with the unit. I needed a UV filter for a smaller tank with a hanging filter (so an in-line wouldn't work) and was very happy to find this at a great price. It's whisper-quiet and includes a power head for great circulation.

Two small words to the wise:

1) The product is a snap to set up if you're a little mechanically inclined because the instructions that come with it leave something to be desired. The illustrations are microscopic and the text says to see illustrations that don't exist.

2) Make sure you look at ALL the photos before you decide to put this in a smaller tank (20 g or less). It takes up more room than the main picture might lead you to believe but is rated up to 50g.

With that said, I would heartily recommend this to anyone who's ever dealt with an algae bloom (or anyone who doesn't want to).

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I got this smaller 9 watt version for a 125 gallon tank, just to see if it will work. Turns out it work so good, I didn't need to buy 2 after all! No my tank isn't lightly stock either, it's overstocked with Koi's and Goldfish! You already know how dirty those fellas get. Anyway, Best money ever spent for a aquarium, worth every cent! Worked better than advertised! Tank began to clear up within 3 hours, mind you this a HUGE 125 Gallon tank! The next day, water was crystal clear! I mean you can see from one end of the 6 foot tank to the other end and the other side of that glass! AMAZING! That's >6 feet of pure visibility as if there's no water! I got 4 bubble/aeration in my tank, and the streams of bubbles coming out looks like sparkling diamonds and has an awesome effect that i never notice was there!

You don't need 2 of these! Just buy one and have a good day! This is how incredible the 9watt is, just imagine how powerful the 24 watt would be. Fish is happy, i'm happy, all is good."

Other facts: Plug and play, doesn't make a sound, looks difficult to set up but isn't. The water flow is slow, suppose to be that way for max "killing" power and efficiency. Doesn't shock me like the other products have. Built solid, no signs of electrical leakage or water leakage anywhere. Mount the control box on the OUTSIDE of tank. Instruction manual does leave out a lot of info, but who's really an idiot anyway? If you can keep fish alive, let alone Kois, you're not the average Joe Schmoe that needs step by step guidance anyway. Seriously!!

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Two of my kids tanks turned green while we were away on vacation. I think our neighbors overfed the fish. Anyway, after chasing the algae blooms on the 5 and 10 gallon tanks without success (repeated cleanings and water changes), I purchased the Green Killing Machine. After 48 hours in the pea-soup green 10 gallon tank, the water was noticeably cleaner. After 72 hours, the water was crystal clear. Then I transferred the unit to the 5 gallon tank. After 48 hours, it too is crystal clear.

If you have an algae bloom, this is your ticket.

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The Green Killing Machine 9 watt worked wonderfully for the first three months I owned it. Water was crystal clear, and even if the submersible part of the unit was big and bulky it was worth disguising to have such a trouble free aquarium.

Then, despite weekly routine cleaning and maintenance as suggested per the manual, the charging unit stopped working. Only it didn't just short out. It fried itself and burned so hot that it melted through the plastic housing before I caught it. I don't know if and when the little red light went out; it's simply not something most people check on a daily basis. What I do know is that the problem could have been seriously compounded had the unit continued to smoulder.

Based on the potential for danger and the fact the unit eventually stopped functioning beyond repair, I can't recommend it at all.

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