Oh Paul that's the beauty of the DIY one!
There's no way I could have been able to afford the refills on the original design ($30 a pop) but the DIY one from the filterguys uses a refillable cartridge so I can buy the media in bulk and don't have to pay for the cartridge over and over again.
The media itself is only $10 per refill if I buy it by the half-pound (even less if it works well and I buy more at a time). I'm much more likely to be able to do that.
It's 3:25 AM and my pH is still 8!!!![]()






umm maybe every week or 2 weeks and WOW its pricy hope you have a skimmer that dosent pull up to 35scfh 
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