mag 350 mod any good?

looks like a easy DIY that should work fine.

Actually that's quite cleaver becasue it dose talk away from the need for the hollow basket by replacing it with a porous sponge. But its very important in a circumference filter that the center section of structure not be dense or it will defeat the purpose of water ability to flow toward the center strainer pump without dropping GPH, and that sponge looks to be porous enough. The only thing missing is the fine outer layer which could be Poly-batting which would do 2 things, 1st mechanical polishing with excellent endurance, 2nd the Poly-batting is excellent at sealing off bypass gaps in the sponge and top bypass grate. As far as the bio-wheels go I don't want to bust your concept but they have pretty negligible impact on supporting bacteria, defiantly far and away less then the sponge he is using IMO. I have a whole bag of new Marineland bio wheels I haven't yet thrown away. Ill send them to you for the cost of shipping if you want them.

GOOD MOD, Although the photos appear a bit short distorted.

The link doesn't seem to be working for me.

was working earlier

Copy the link location then type it into the browser, you'll see it has two https - eliminate one of them, and it will work

This MOD Is basically using the more friendly user sponge as opposed to the complicated basket, just like the CFS500 only much smaller. I have to warn you though before you go out and buy a sponge make sure it fairly pours as a fine sponge will cut efficiency and endurance down dramatically, and I recommended you leave enough room to allow a fine thin layer of Poly batting. It appears from the photos this mod left plenty of room as seen below. Also in the bottom photo the sponge gap at the motor intake may allow substantial bypass, a longer sponge to the base of the motor intake cover by Poly blanket would insure 0 bypass. Other then that its a great looking MOD and I might try it using pieced together porous FX5 sponge.


Below you see basically the same thing the basket representing the necessary porous center of the circumference with the Poly and blue-bond layer on the outer most orbit for polishing. This basic concept is what make it work, plug the center with fine sponge and you have defeated the design efficiency. The sponge being used above look OK and porous enough.