High levels of nitrates.
the nitrate chemicals from pollutions can get blown by the wind and once they are in the water it affects the water and causes water pollution
No
what causes water hammer in pipe systems?
none. all nitrates are soluble.
Nitrates are ionic compounds soluble in water.
a leak
Acid rain contains nitrates, as does some runoff water from fertilized soil.
No nitrates are not needed.Mainly CO2 and water is needed
Your incoming fill water may be hard.
In a word, Yes. Phosphates are really a non issue. Phosphates are an algae food but IF YOU ARE MAINTAINING PROPER FREE CHLORINE LEVELS for the CYA level in your pool they are a non issue and you will not get algae. Phosphates are also often not the limiting factor in algae growth. Nitrates are also algae food and the only way to remove nitrates from pool water is by water change. There is not a nitrate remover that a pool store can sell you so nitrates are not normally tested. Phosphate removers have become big business and big profits for pool stores and chemical distributors but they are an entirely unnecessary product 99% of the time if proper pool maintenance is followed. High phosphate water is perfectly safe to swim in.
You should get the pool water tested for 'phosphates' and 'nitrates', both of which can encourage algae. Common problem these days. Easy to get rid of if too high (phosphates max. 125ppb, nitrates max. 25ppm). E-mail me if you need more help.