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 pool clarity problems began with an algae bloom, be sure to kill algae before clarifier treatment. This requires 10-30 ppm of chlorine, with a suitably low pH of around 7.2. Operate the filter 24 hours per day during treatment, or as long as possible each day and night to improve circulation and filtration.