Use of Xylem in filtration is an ingenious idea but I have two doubts: -1. Compared with the requirement for filtering media how much xylem can ...

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Use of Xylem in filtration is an ingenious idea but I have two doubts: -
1. Compared with the requirement for filtering media how much xylem can be available?
2. Can xylem be removed without seriously damaging the tree ?