At his last doctor visit, the doctor lowered the atenolol dose to 25mg to be taken at night due to a pulse in the 40s and my statement that my brother seemed a little slower moving. After 10 days on the reduced dose, my brother developed complete insomnia (no sleep at all for 6 nights straight).
One way to determine the GSM is to weight the towel and measure the towel length and width. Let's compare, for example, two towels both weighing 1.5 pounds (680 grams) but with different dimensions, as follows: Towel A weighs 1.5 pounds (680 grams) and measures 26 by 52 inches (.66 meters by 1.32 meters). Calculate the surface area by multiplying the length and width in meters: .66 times 1.32 equals .8712 square meters. Divide the weight in grams (680) by .8712 and find that you have a 780 GSM towel.
For this reason the joists under the bathtub may be reinforced especially in installations that utilize cast iron or whirlpool tubs. Tub Weight Bathtubs range in weight from about 60 or 70 pounds for a fiberglass tub up to 500 pounds for a cast iron whirlpool tub. Cast iron tubs are more durable with a longer lasting finish than fiberglass. Fiberglass feels warmer to the touch when you first add water and does not cool the water the way iron may.