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.
Mustard Algae. Mustard algae is a chlorine-resistant form of green algae (yellow-green to brown in color). It often resembles dirt or sand on the bottom or sides of a pool. Treatment: Same as black algae. In certain cases, when a pool is full of algae, the algae must be vacuumed directly out of the pool.