The most common cause of a goiter is lack of iodine, ...Even with the right amount of iodine, the thyroid gland can swell, creating a goiter. This can occur in any type of thyroid disease, including hyperthyroidism, hypothyroidism, thyroiditis, and thyroid cancer.
Shock treatment powder bags. Skim off whatever algae you can from the pool using a pool skimmer. Scrub the inside edges and walls of the pool with an algae brush to dislodge stuck algae. Purchase sufficient amounts of algaecide, as noted in the instructions on the bag, that match the total gallons of water in the pool.
Gather the algae with a flocculant. A flocculant or coagulant clumps the algae together, making it possible to vacuum living algae. This may take a hard day of work, but your pool should be clear by the end of it. This is the fastest way to get your pool looking good, but it does not make the water safe to swim in.