For our codes, water features cannot be over 18" deep or else they fall under the fencing/safety requirements of a swimming pool. This one has a submersible pump. Usually we have an external filter with backwash capabilities.
retaining wall: white cement wall is reinforced CMU block wall with a alabaster white smooth stucco coat finish.
fire pit sand: white chip seal used in roofing
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charcoal gray poured in place concrete wall with a hard trowel finish. It's what concrete contractors call a "burned' finish.
For our codes, water features cannot be over 18" deep or else they fall under the fencing/safety requirements of a swimming pool. This one has a submersible pump. Usually we have an external filter with backwash capabilities.
Q