I had the original Kreepy Krauly when I bought my above-ground pool second hand. The lady had it for 10 years and it still worked perfectly. After a few more years with me, the thing finally died from old age. I bought a "generic" pool vac that was similar to the Kreepy Krauly and cost me $86.00. It lasted a whole whopping year before it quit working and fell apart. My other alternatives costs over $300 and I didn't want to risk spending that much money on something that may fall apart, again. After some major internet searching I found this - just like my original tried and true Kreepy Krauly!Thus far, I am thrilled! This bad boy is even better than my original. The part that goes into the skimmer is shaped like a "Y" sort of. The bottom goes in the skimmer, the top attaches to your vacuum hose, and there is this black cap thing on the other "Y" side that you turn to adjust how fast or slow the thing operates. It also comes with a pressure tester. Before attaching the vacuum to the other end of the vacuum hose, you attach the pressure tester. (While you do this, stand near the skimmer - you will adjust the black cap thing by either tightening it or loosening it.) Watch the pressure tester. You will see two lines - one says min, the other says max. You want to adjust the black cap tighter or looser to get the floater inside the pressure tester to balance between min and max. Note: (Hold the pressure tester under water with one hand while you adjust the knob in the skimmer with the other.) The whole process takes about a minute to get it just right. Next, you remove the pressure tester and attach the vacuum.Others have complained about the noise this thing makes - basically, it goes click, click, click, click...... You get the idea, right?! The higher the pressure, the louder the CLICK, CLICK, CLICK..... Also, the higher the pressure, the faster it vacuums. The lower the pressure, the more quietly it operates, AND the better it vacuums!!!! I relate this to vacuuming your carpet in your house - if you move the vacuum slowly over the carpet, it picks up more dust. If you zoom it over the carpet, it picks up less. So, just know that even after you do the pressure test and think you have it perfect, you can always unscrew the black cap on the "Y" valve in the skimmer just a little while the vacuum is in operation and slow it down a little if it seems to not be as cleaning as well as you like.We have no trees around our pool, so it gets full sun most of the day. Our biggest debris problem seems to be pollen, the occasional crape-myrtle bloom that catches the wind in the summer, and bugs. My best advice is after you run it the first day, go ahead and clean your skimmer basket at the pump and backwash your filter. Do that for the first couple of days until the bottom of you pool appears "mostly" perfect. Then, you should be able to go to backwashing and cleaning the pump's skimmer basket about weekly.One more tip - DO NOT PUT CHLORINE TABS IN YOUR SKIMMER BASKET!!!!!!! Some local pool store nut told me I needed to do that last summer and it ate out the seals in my pump in two days. Then, she tried to sell me a new pump. Cost me about $80 at a local electrical motor shop to have the seals replaced on my 2 Hp pump. If you need more chlorine, buy an extra floater and fill them both up weekly.Overall, great little pool vacuum, gets the job done well, and with good maintenance of your pump skimmer basket and backwashing, you should get great results! (Try putting a little Vaseline around the edges of your pumps skimmer basket if you have trouble removing it to clean the basket! It works great and make the job a snap!)Hope it works as well for you!