How much iron out is needed for a pool of 5000 gallons of water?

The amount of iron-out product needed for a 5,000-gallon pool depends on the concentration of iron in the water and the specific product's instructions. Generally, a common recommendation is to use about 1 quart of iron-out per 10,000 gallons of water for initial treatment, so for a 5,000-gallon pool, you might start with about 1/2 quart. Always check the product label for specific dosage instructions and conduct a water test to determine the iron levels before treatment.