Bubble mailers come in an infinite amount of sizes. One you can buy in stores are usually 4X8, 5X10, or 10X13. They also come in sizes such as 14X18.75, 15X32, and larger. Bubble mailers can also be special ordered to make them are large as you need.
The easiest way to find the GCF (in my opinion) is to find out what numbers mulitply to 90 and 480:90: 1x90; 2x45; 3x30; 5x18; 6x15; 9x10(You know you can stop at 9x10 because after 10, at 6x15, is 15. The numbers go in order if you list it out: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90)You can do the same thing for 480.480: 1x480; 2x240; 3x160; 4x120; 5x96; 6x80; 8x60; 10x48; 12x40; 15x32; 16x30You can stop at 16x30 because when you compare it with the factors with 90, you can see that 480 does not have any factors with 90 and 45, so the next highest is 30.Answer: 30
Stop adding any chemicals to your pool a week before you plan to drain the pool. make sure you remove as much debris(such as leaves etc) as you can from the water. Also make sure the skimmer basket is in place so nothing gets down in your system. You are not going to use the pool pump as only the bottom drain will be used and will tax the system and draw debris into you pump and pipes. Go to home depot and they sell 110 plug in submersible pumps for around 60$ that attach to a garden hose. You can use the water to water your plants and bushes.place the pump in a bucket with holes in the bottom at yhe deep end of the pool. it will take about 2 days and take out all the way down to 14 inch down at the drain! A pool supply store may rent (maybe even for free) a pump too. Or maybe any rental business. It is very important that when you are emptying any in-ground pool that you empty the " drywell" which may have been installed for your pool. It is preferable to empty the pool quickly and in the case of concrete pools or others, to remove the bottom drain plug to release any water pressure under the pool. Failure to do so where there is under-ground water may cause your pool to lift partially out of the ground. In fiberglass pools this may crack the walls. Ask me- I know. It cost me a $1000.00 to repair.