Sorry to disagree but the main function of a DSB is for nitrate reduction.
If you are planning to do a DSB, From what I've seen, the easiest to maintain is a remote DSB using a 5 gallon bucket full to within about 4-5" from the top. You simply install bulkheads or Uni-seals on each end of the bucket above the sand and flow the water across the top of the sandbed. Search "Remote Deep Sand Bed", I'm sure you will find information on them along with plans.
The best thing about a RDSB, is you can easily take it off line when the sand needs to be replaced without fouling up your system, then simply replace the sand and fire it back up.
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