... water. GENERAL DESCRIPTIONGravel filter is special designed AUTOMATIC filter for water from reseviors and ponds, which normally carry ... clays, plants, even animals.Gravel filters are particularly effective for filtering algae, organic matter and recycled water.It uses ... corrosion and damageto the protective coating.Large service openings for inspection and service.Modular design (ARRAY BATTERY) is ...