Rid-X has been discussed on this forum somewhere regarding the pros and cons. I don't know what the cons are, but I do want to say that not one person I've spoken with who used it had any negative reactions to their pond life. Fish and frogs are healthy.

Rid-X doesn't even work for septic tank use for the same reason David gave. Bacteria is everywhere, it will grow very fast to fill what an environment will hold. Dumping in more has no effect other than adding more waste to the pond.

The biggest con I can think of is that a ponder can kind of get used to dumping stuff into their pond trusting internet "experts" without really understand what's what. Maybe the Rid-x doesn't kill your fish, maybe the stump remover won't, maybe the iron won't, maybe the acid won't, maybe....but one day, what happened? It can be a bad habit imo.

My rationale for not particularly recommending Rid-X is as follows:
a.) At one time, if memory serves me correctly, Consumer Reports evaluated the use of this material in septic systems resulting in a conclusion that there was no significant difference. Also, in my state - again if memory serves me correctly - one of the state agencies attempted to evaluate the effectiveness of such treatments on the longevity of mound-type septic systems with respect to extending longevity. The result was non-conclusive, i.e., no particular statistical significant difference. However, such studies and others out there are focused on ANAEROBIC systems as exist in septic tanks...not in our ponds which are aerobic. The company specifically states in it’s FAQ section that it has not been tested and is not recommended for aerobic systems. Of course they are focusing on waste treatment systems and not ponds. Click here for Rid-X FAQ
b.) If you look into what is actually in the product you will find that it supposedly contains enzymes and dried bacteria specifically meant to work in an anaerobic environment. However, there is some indication that is not all that is in there. A bit of research will show you the basic patent for Rid-X. Click here for Rid-X Patent info
One of the ingredients that appears to be present is a form of pyrophosphate to help buffer pH as well as increase metabolic activity in the anaerobic environment. Pyrophosphates are generally hydrolyzed and broken down in aerobic environments to orthophosphates...the form that is readily taken up and used by algae. It is therefore potentially possible that adding Rid-X that you might be adding phosphate to your pond although there may be formulations out there that contain no such compounds. Given that our ponds are closed or recirculating systems such compounds might prove detrimental longterm (i.e., enhancing algae growth).
c.) As you probably know in a truly balanced and designed scientific study you run a control study in which has all the same things going on except you don’t have compound Z added. You compare one against the other. Drug manufacturers go one step further: they have a third group in which they typically give a sugar coated pill that looks exactly like the experimental pill. The reason for this is the "placebo effect"...just the fact that a person receives a pill and is told that is very strong acting causes them to believe and actually demonstrate an improved response. We tend not to trust those studies that are funded by the companies that are marketing the product because we suspect bias in the analyses and interpretation of the data. The problem we have with adding stuff to our ponds is that we lack ANY type of reasonably controlled designed experiment. That being said there is, I suspect, a significant "placebo" effect in that I’ve paid money for this product, I’ve added it to my pond, others (with or without a connection to the product) say it works very well therefore any results I see must be due to the product I’ve added!!

If you think Rid-X will help your aerobic system by dumping in a product specifically designated to work in an anaerobic system then by all means do so and feel happy about it. I wouldn’t add it to mine for the possible introduction of phosphates plus that’s not what it’s meant to be used for. But that’s just me and obviously I’m working with my own set of biases. If you feel it’s working in your system then don’t listen to me but above all else...Enjoy your pond!
—David

Also, I don't think anyone on this site considers themselves an "internet expert". We only provide our own experiences with the questions asked, and others must come to their own conclusions.

"Also, I don't think anyone on this site considers themselves an "internet expert". We only provide our own experiences with the questions asked, and others must come to their own conclusions."

And well said it was!

"Horton"