lastly install the top cap. Make sure you know the differenc between male and female slip fitting. Or in my case just pay attention. I bought a male slip cap and i had to go buy a 4" coupler. Opps. Let it set for a day or so the fill with water and check for leaks. I use the closet base ( I think thats what they are called), because you can mount them to a peice of wood for a nice sturdy base. I clean mine out 2 - 3 times a year. You can make this any size you want. The one for my main tank is 4 foot tall. I put a cup of mrs wages pickling lime in it once a month. I started it out with 3 cups.
Feel free to ask any questions. Also mods, you can move this around if needed. I give the club full permission to use this info as you wish.