Are you referring to the EZflow that Infiltrator now sells? With the polysteyrene inside a net?
There is an EZflow gravelless technology approved by Ring Industries approved by ISDH, however I discovered that Infiltrator bought out Ring Industries in 2009 and now sells the product. However, ISDH has not updated their website with that info. I'm assuming Infiltrator has not made any changes to the product.
Correct
Infiltrator has not made any changes to the standard EZflow but they have a "Denser" product that is identical in every way except the peanuts are of a denser foam.
Last year Infiltrator introduced their version of an EZflow type product at the Pumper show. I was told what I was looking at was all that existed on the planet and it was only finished a day before the show.
Obviously Infiltrator abandoned that idea and bought EZflow. The Infiltrator version was of a denser foam as well so obviously that was a pet peeve with infiltrator wanting something with more density.
I myself have seen no ill signs of the standard EZflow and I have not tried the denser material but may give it a shot this season, it's the same just heavier by volume and more expensive than the standard.
So basically with EZflow you get the best advantages of all the other bed types without the disadvantages.
Pro's
light weight
fast to install
lot of surface area for bacteria
No gravel fines
No plastic roof over the lateral
can bend a trench any way you want no hassle
Con's
Very bulky to deal with
Wind will blow the bales and logs if not anchored while installing or waiting installation
Sunlight can damage it if left out more than a few months (this could be fixed with UV inhibitors which Infiltrator may do)
So it's a light weight gravel bed without the fines or compaction
