Quote:
Originally Posted by kien
+1 one. I have had an Orp probe on my tank for 3 years and have watched to go from 300 to 450 all in a matter of a day without any noticeable changes in my tank. Some days it'll sit at the low end, sometimes it will sit at the high end. I've read up on it as well and still don't really understand what the heck ORP is telling me LOL.
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Basically it's a measure of good vs bad. 350 450 is a good range. But really if it goes to high or low you would probably know without a meter. Ozone is o3. So if you have good o2 in tank it should already be oxidizing the filth in tank. H202 is another way to raise orp.