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Nitrates can cause algae growth in pool water. Nitrates are introduced into pool water in a variety ways such as body waste, urine, sweat, bird droppings, acid rain, well water, run off from lawns and gardens and leaves.
Nitrates that are above 10 - 25 ppm promote accelerated algae growth. Adding a phosphate remover can help to hold back algae growth so long as the pool is well maintained and the nitrates are below 10 ppm..
The only way to eliminate Nitrates is to drain and refill the pool.