Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to diagnose and remove any swimming pool stain [title] Look at the color of your pool stain to classify the cause. [step] There are various stain colors that commonly appear in pools, and identifying yours will lead you in the right direction for treatment. Depending on the cause of the stain, you will need a unique removal plan.

Ending1: [substeps] Common pool stain colors are red, green, black, and so on. A saturated pool stain doesn't require removal. Ending2: Or, apply a general neutralizer to your pool water to help the color reverse. Assess your pool water to determine what kind of stain you are seeking treatment with or if it is even fresh. Ending3: [substeps] If the pool stain is caused by a virus or fungus, your first steps will be to isolate the source and treat it. Luckily, the stain can often resolve themselves on its own after the threat of infection dissolves. Ending4: [substeps] The two main stain categories are metal and organic based stains, which come in a variety of colors. These color combinations include green-brown, red-blue, blue-green-black, green-brown-red, pinkish-red, or brown-black-purple.

Answer format: ending1/ending2/ending3/ending4