In Brentwood, Los Angeles Pond Builder handles pond filtration upgrades, from the first design conversation through construction and ongoing care. Persistent algae is usually a filtration or stocking problem, and upgrading the system solves it more reliably than repeated chemical treatments. Brentwood's larger lots and mature canopy leave room for koi ponds and meandering streams, though heavy leaf fall makes skimmer placement and maintenance planning important. A properly designed biological filter supports the bacteria that break down... read full review »