The form of phosphorus used by plants.
Cause excessive growth in aquatic plants (especially algae), leading to suffocation of fish and other aquatic life. Found in laundry detergents, dishwasher detergents, and all-purpose cleaners.
Inorganic salts of phosphoric acid. ... (12 Dec 1998) ... 
Increase the water binding capacity of cured products, which increases the yield of the product and improves retention of brine
Phosphates refers to a group of minerals where phosphate (PO4) is an important constituent.
A byproduct of fish and inverteabte metabolism and decaying organic matter, such as uneaten food. Can cause algae problems if you have high levels.
Certain chemical compounds containing phosphorus. 
salts containing phosphorus; essential to some body functions such as the bones and teeth