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 you have mustard algae in your pool, use a product such as Yellow Out in addition to chlorine to help kill the bloom. Yellow Out requires 2lbs. per 15,000 gallons of pool water. For green algae, a product like Green to Clean may be helpful to add in addition to the chlorine. When adding these chemicals, make sure to wait five minutes between adding the chlorine and either Yellow Out or Green to Clean.