I purchased a used pool and equipment. Unfortunately there are no manuals with anything and I am trying to learn as much as I can about install and use. Thanks to this forum I found out I have a Raypak/Rudd 266 BTU gas heater. I have taken pictures of the pump (splapool 72729, 8 amp,1 SPL HP, 75 GPM, 115 V), there is also a sand filter that has a couple model numbers (D-400 or 500 or 600). The circumference of the filter is 52 in. Any basics of install and initial setup/use would be appreciated. There is no sand in it so I don't even know what/how much sand to use. I am also interested in your thoughts on the overall group of equipment, is it appropriate for pool?