[Delphinus]

It's not so much a "mod" per se as it is a sponge replacement using quilting mesh available at any craft store. You cut a 2 circles of it and replace the sponges with it. I think I paid 58 cents for a 18" square at Michael's (seriously, 58 cents .. less than a dollar anyhow. I felt like an idiot putting it on debit, but in my defense, who really carries cash anymore?... I vaguely remember having had cash once ... but I think it was before I had kids.)

Anyhow, Michael's for sure, but apparently you can get it just about anywhere (Walmart, craft stores, etc.) I think O.C. can also set you up. Edit: I see they beat me to the post. Yeah, you can get it from O.C. (... but then again, Michael's has girls working there and if you haul in your kids into the store with you, you can pretend they are flirting with you because you have kids, instead of just saying "tee hee! Look at the bald loser with 2 kids trying to buy 58-cent quilting mesh on debit". It's the best action I've had in years! I still got it bay-bee, I still got it!!)

Using the quilting mesh and a MJ1200 powerhead, you can run easily up to 600-750ml of pellets in a TLF Phosban/150 reactor without issue. I have about that in mine for a month now and it's still tumbling like crazy and I have not had to shake it or anything in all that time. I have my valve full open, I keep the valve because sometimes it easier to start the pellets tumbling properly by slowly opening it as opposed to an "instant on" type thing, which sometimes just slams the pellets in one single mass into the top of the reactor.