well I can tell you what MINE was like. I got two "Current USA" UV sterilizer from ebay, one 8 watt and one 15 watt. The 8 is for my smaller reef tank (not put up yet do to a break in the cap) and the 15 was for my 75g planted tank. I GOT them for the planted tank due to a massive 2 month battle with GW. I tried EVERYTHING. And I saw a thread on here about a guy who put a UV light inline and it cleared right up. So I did too. I put the UV inline on the Other XP3 (not the one with CO2) and plummed it on the intake line (not sure if this was wize). I had a little trouble getting the siphon to work again...took a couple of positions changes...and not it's running smoothly. My wife was really hoping it would work too, she didn't want me to be frustrated anymore, and she was worried that I may have wased my 75 dollars on these two things. (yes together from ebay at around 75.00) The first day or three were minimal changes...then on the fourth day or so I started to see more than an inch into the tank again. I could see a plant or two. then after about another week the water was just White cloudy...like a haze. So that's when I did a couple of good water changes (about 40-50%) for two days...really getting the debris up. I noticed that most of my plants had a lot of dyeback...so I also did a huge pruning job. After the second water change I added new carbon to each filter. And waited again to see what happened. The water cleared right up and not with such clarity...the glosso I had been hating and wanting to tare out started to finally grow horizontally. Now I'm back to the process of stocking the tank with cherry reds...(vinnymac is the man)...rummy nose...and discus. After the inital clear up I ordered 30 more cardinals and have only lost like 4, the first shipment was a little more than half mortality rate. So my water is now a lot more stable and my fish are happier. Now I don't know what to do with all the red growth in the plants...(I found out they are supposed to do that, but man it's really red). like I said it was my cure...it may be yours too. either way it's not a bad device to have around for emergencies...your quarantine tank could always be more sterile.