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.
5 Tips for More Effective Algae Removal. 1  Donât use an algaecide before shocking, pool shock will break apart the polymer chains, rendering it useless. 2  Check your pH, before shocking, and then again a few hours after shocking.  Dilute your chlorine in a bucket for vinyl pools; for plaster pools, just pour it in.