No need to DIY, you can buy refillable media container from Maryineland from any mail order places for under $4. http://www.bigalspets.com/refillable-media-container-for-penguin-200b-350b.html
A better way to DIY is to tie two discarded media frame at the bottom with fish line, so it can open up as a hinge. When you sandwitch the filter pad in between, it will hold tight when you slide into the slot. Cheapest place to buy filter pad substitute is poly batting from JoAnne fabric by yard. No need to buy the thick size, the thinnest and cheapest one works best as it allows good flow.
A better way to DIY is to tie two discarded media frame at the bottom with fish line, so it can open up as a hinge. When you sandwitch the filter pad in between, it will hold tight when you slide into the slot. Cheapest place to buy filter pad substitute is poly batting from JoAnne fabric by yard. No need to buy the thick size, the thinnest and cheapest one works best as it allows good flow.
