Summer is approaching, you have a pool that needs a little maintenance (like most pools after the winter), get it set up for use! Hook the pump up, circulate the water, dump a few gallons of bleach, see what happens. Run to
Leslies Pool Store (behind Blockbuster, near Target in K-ville), grab a free water sample bottle and a
basic $10 test kit (ph and chlorine). If the chlorine is a lil low, dump more bleach in. Measure the pool dimensions including depth so the pool store can calculate how many gallons your pool holds. Bring a sample back, they will test it on the spot, give you a printout showing what levels you're at, the recommended levels, and how much of each chemical you need. Don't buy anything, read the printout and do a little net research. Like said above most pool chemicals are just household chemicals (bleach, borax, baking soda), with the exception of
stabilizer/conditioner (cyanuric acid), which can be ordered cheaper online. Once you'll get it dialed in, you'll have a pool to enjoy...and the frog might even go away.
Best part is, being a rental you plan on leaving in the fall/winter...you get to walk away from it, and get the experience of pool 'ownership' that will be useful for deciding if/what kind of pool to build at your permanent house.