This is a great find. Saved $10 off another site and got free next day shipping. Instructions easy to follow. I was replacing an old SunZone unit and only question I had was with the AMP plug which was on the SunZone. I removed the old wires and inserted the white & black in same locations, removed the former green ground wire which is not needed with the new unit. Installed on tub and it is working. Now to see how long this unit lasts. I hate to admit that I didn't know these had to be replaced. The SunZone was the original and 15 years old, so I guess I haven't had ozone for a long time. The only reason I replaced is because it was causing the GFCI to trip. I will see how the water improves with this installed.

If you have a hot tub with an ozone generator please know that after 2-3 years it will either be producing little or no ozone. You will also likely see that there is water backed up into the unit due to a failed check valve from the corrosive liquid that accumulates from the ozone generation process. There is an internal part (typically for a corona discharge unit) that will reach its end-of-life and on older model ozone generators and there typically aren't replaceable parts to get them working again. This is a next generation ozone generator that is expected to last at least 5-years. It includes an AMP style power connector which does not work for my Watkins/Hot Springs tub so I cut off the old spade connectors from the last ozone generator and spliced them onto this unit. It also included a new check valve and hose. I really liked the price point, replaceable corona discharge chip and overall warranty. I am hopeful it will be less expensive to replace the chip next time instead of buying a whole new unit. Thus far it is performing quite well and I'm pleased with the purchase.

This is the second time I have purchased this exact model ozonator. Last one seemed to have a very high level of ozone production, much more than previous, different models. This time around, the unit is labeled as a different revision, but it is the same model. I am not sure it is as good as the last one. It seems to produce less ozone that the last one, but it is definitely working.

UPDATE (2 weeks after above comment was written): This unit has completely failed. No green light. No electrical continuity through the generator. Tested the spa controller - all good. Proper voltage across terminals. After reading a few negative reviews, I am expecting to have trouble obtaining warranty restitution. Will update after that is determined.

UPDATE -2022. In the time since the last update, the manufacturer was very agreeable to sending a replacement. The tech I spoke with was very forthcoming, and as a gesture of good faith, sent me an exact replacement for the APG-U unit which was failing, and ALSO a second unit (MCD-50) which he included as backup. Again, the APU-G unit lasted only 8 months before total failure. I then installed the MCD-50 unit, which also lasted a short time, with noticeable decreasing ozone production over time until nothing at all.

Note that there have been several units which look different but contain the same Gen 1 internals. Some units have a large case (MCD-50)which contains either one or two of these ozone production cells. Other units are smaller on the outside (APG-U) but contain a single APG Gen 1 cell. DO NOT BUY ANY PRODUCT CONTAINING A GEN 1 CELL!

The new Gen 2 cell is completely different. Though just as small on the outside, the Gen 2 units are completely sealed (potted) and cannot be opened. This is the one you want. After realizing that there really is no competition in the market, I am nonetheless happy to report that DEL Ozone has abandoned the Gen 1 units completely. The new unit has been operating for four weeks, and I am glad to say that the smell of ozone is stronger than it has been the entire time I have owned the tub (20 years - seven or eight ozone generators). I am cautiously optimistic that this is the end of the saga, and that the new units will last the full 15,000 hours they are rated for.

UPDATE 5/5/22: KEEP YOUR FILTERS CLEAN!
Just an FYI. The smell of ozone had been decreasing recently, and I feared the now 3 month old unit was failing. Turns out my cartridge filter (which feeds the circulation/ozone circuit) had gotten clogged and reduced the flow through the ozone injector. Replacing the filter had an immediate effect of returning the ozone smell to its high level. I now wonder if in the past, insufficient flow through the injector had caused reduced lifespan of previous generators due to a back up of the highly corrosive gas. I will definitely decrease the time between filter services.

I've gone through many ozone generators, they typically only last a couple years and even the ones you can replace cells on aren't worth it since the cells cost as much as the newer versions. This one has been going fine for the first couple of months since installing, small, easy to see the green light. I'll update if it dies prematurely otherwise for the cost its worth it to reduce chemical usage in a spa. Like I said, if you get 2 years its a good buy, less than that then no.

It works great. Don't know much about sap electrical, but I was able to figure it out. It only came with one type of connector, luckly that was the one I needed. I have easily installed the ozone generator myself and it has worked great for The toe months I have had it. I have recommended this product to my neighbor