Once you stopped with the pool store you went on the right track.
It sounds like you have a cartridge filter, and that it's clogging quickly from all the stuff in the pool, so you have to keep cleaning it. That's normal. You cannot backwash a cartridge filter. Sorry.
Are you vacuuming the pool as well? If not, you need to.
You can use your OTO kit to measure much higher than 5ppm for chlorine. You need to buy steam distilled water (at the supermarket) and, if you dilute pool water with distilled water at a 1 to 1 ratio, then when it say Chlorine is 5, you really have 10. Search PoolForum for the Shotglass Method.
If you can get FC and TC, you don't need get CC. TC=FC + CC so just subtract to FC from TC and you'll have CC (deal level is 0).
You'll probably need more borax to raise pH.
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