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.
If your pool has this kind of algae, get an algaecide specifically made to eliminate this tough kind of algae. The active ingredient (ammonia or metal) for the algaecide you choose should be at least 30 percent. If it is less than 30 percent, it may not effectively kill all the algae in the swimming pool. After adding the algaecide in your pool, let it stay for at least a day before you do anything to the pool.