Preformed Garden PondsPreformed garden ponds sound perfect don't they. Dig the hole. Fit in the preformed liner. Add water and away you go. Off to preformed garden ponds paradise.
Not only that if you live any where there is cold weather and freezing temps, the ground can heave as it freezes and push the fiberglass pond shells so that it is not level anymore.
They tend to get fragile with age. And who wants a cracked preformed pond liner?
You cannot install a bottom drain. Not bad if you like to spend a bunch of time cleaning the pond. Especially that sludge that accumulates on the bottom.
Even with out freezing the preformed garden ponds often settle and shift. Causing the waterline to lose its level.
Any large, heavy decorative rocks placed on the lip to hide the edge can crack the shell which is extremely difficult (if not downright impossible) to repair. Another potential drawback of preformed water garden ponds.
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