Filtration Requirements

Each of the larger systems described in this chapter requires a wet/dry filter for best results. The filter should be outfitted with a biological filtration chamber, as described in chapter 5, "Nuts and Bolts." I suggest installing a model that allows you to place a polyester fiber pad above the biofiltration medium to trap partic-ulate matter. You should also be able to remove the biofiltration box without having to move the sump. This may mean an extra allowance for "headroom" underneath the main tank. Having a removable box facilitates storing the biofiltration medium so it will not dry out during your semiannual system reset. Keeping the medium moist ensures retention of the maximum population of beneficial bacteria. I discussed the various other advantages of this type of filter system in chapter 5, "Nuts and Bolts."

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