I will be getting my first pool tomorrow, Intex 18'x48". My ground is level and would like to know what to put down and what chemicals to use to keep grass and weeds from growing? I'm planning to upgrade the filter and pump and would like some recommendations? What size filter and what size and speed pump? For those of you here, who have upgraded your Intex pumps and filters, can you tell me how to modify the plumbing? I've been reading all the different posts about DE, Sand, and Cartridge filters and have come up with confusion in choosing which kind. I want the easiest, cheapest, fastest way to keep this pool clean and running. I'm not exactly sure what comes with this Intex pool, but should I also get a better skimmer, if it doesn't come with one? I'm planning on using the BBB method after reading about it here. It sounds pretty easy if I keep up with my pool. I saw two calculators here and would like to know what everyone is using or if I should use both, the BleachCalc and the one by Justin?