I found an interesting article about the subject:
http://aquaticconcepts.thekrib.com/Articles/PAM_Substrate.htm
Amongst other things, it says the following: "By making this investment, you will find that plants will grow healthy and will stay that way for many years. You will discover that there is much less problem algae. In fact, you may wonder if there is any algae at all! And finally, you can achieve these results without constantly adding supplements to the substrate to compensate for the lack of critical nutrients."
They're pretty costly though, so I'm still not sure. Hope someone's had some experience here.
I know that George feller well, nice guy.
He was one of the last hold outs when we debated their "insignificant effectiveness". He fessed they where not a significant factor in helping plant growth, he was trying to find some positive benefit based on Dupla's sales and marketing claims.
I've had 7 tanks with them, Dupla, Sandpoint, even made 4 of them from raw electrical supply equipment and parts. I live where it is hot in th esummer, so they never come on for 4-5 months out of the year, I never noticed any differences, started shutting them off, never noticed any differences.
With 7 tanks and many others reporting the same things........folks got smart and stop wasting their money on the Dupla BS.
Dupla brought dosing CO2 vai gas tank systems...........which really helped.........but the cables never helped. Folks attributed the entire system without testing each individual aspect.
Same issue with ADA substrate system vs ADA aqua soil by itself, it works fine without all the other stuff. Unless you isolate and test it, you cannot determine what is doing the effect(or not)
Dupla sold their planted tanks as "complete systems", ADA also pulls this same marketing ploy to hock their ADA "substrate system". Sold to hobbyists have too much $$$ and not enough time to bother to test I guess.
I did though.
I have a few clients that had the full Dupla systems, cables, lights, all the CO2 system etc. George only had the cables and a few small additives etc.
Do some searches, ask around, look at the nicer scapes, see if those folks who have a nice tank at a high level use them, you'll have trouble finding folks that use them at such levels.
CO2? Lots of folks use that. Ferts? Rich sediments? Same thing, lots do.
Regards,
Tom Barr