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You can use store-bought masks or make your own using natural ingredients, such as coconut oil or shea butter. Apply the mask to damp hair, then tuck your hair under a shower cap. Wait for the time recommended on the label or recipe, then rinse the mask out.  Look for masks made for bleached or color-treated hair. Nourishing, deep-conditioning, or reparative masks are also a great option. Most hair masks do not contain sulfates, but double-check the ingredient label. You can do this with store-bought masks and homemade masks, including coconut oil. Heat the mask in a small dish in the microwave for 5 to 10 seconds, then use it accordingly. Alternatively, you can stick a bottle of conditioner in a large cup of hot water for a few minutes.  Apply the hot mask or oil to your hair. Tuck your hair under a shower cap, then wrap the cap with a warm towel. Wait 15-20 minutes before rinsing the treatment out.  Alternatively, you could apply a room-temperature mask to your hair, put on a shower cap, then sit under a hooded dryer for 15-20 minutes for a deeper conditioning treatment. Naturally curly or African-American hair is delicate and prone to damage, so it requires a little extra care. When you dye your hair, you shouldn't give up those other conditioning treatments and moisturizing creams. Keep using them as you normally would, but make sure that they do not contain any sulfates. Wear your hair in protective styles as much as possible, such as cornrows or braids. Cover your hair with a hood, hat, or scarf whenever you step outside, especially if it is bright and sunny outside. If you don't like covering your head, apply a UV protection spray to your hair before stepping outside. If you don't want to wear a swim cap, rinse your hair with plain water first, then apply some conditioner. It would be even better if you wait 20 minutes before stepping into the pool, so your hair can absorb the conditioner. Once you are done swimming, rinse your hair immediately. Plan on trimming hair every couple of weeks. How often you do this depends on how fast your hair grows and how healthy it is. If your hair starts to look ragged at the ends, it's time for another trim. The more you bleach or dye your hair, the more porous it will become, meaning it won't hold onto dye very well. If you notice that your hair color is fading or that your hair is starting to look fried, it's time to take a break. Let your hair grow out to its natural color.  If your roots are beginning to show, try a root touch-up kit instead of re-dyeing your hair.  Another option is to use a gloss every so often. It is not as damaging as hair dye and will revitalize your hair color. Vitamin C is found in things like citrus, and helps keep your scalp healthy. Biotin is found in carrots, eggs (yolks), and salmon. It helps make your hair strong and glossy. If you cannot eat the foods that contain these 2 vitamins, then supplements are always an option.

Summary:
Use hair masks once per week instead of conditioner. Make your hair masks more effective by heating them first. Continue to use your usual products if you have natural hair. Protect your hair against the elements. Cover your hair with a swim cap before getting into a pool. Trim your hair regularly to keep it healthy. Take breaks from bleaching or dyeing your hair. Consume vitamins that are essential to hair health.