Honestly, get a good test kit, any other advice would just be guessing and throwing money at the problem, and if the goal is to save money a good test kit is the way to do it. You can try randomly dosing with chlorine, it may clear up, or it may not, without the ability to do an overnight chlorine loss test (which you need the FAS-DPD chlorine test to accomplish) we don't enough know if your problem is organic or metals, or both. You could try to have your water tested for metals, at a pool store, and add sequesterant if the test is positive, but again, that may be only treating half of the problem if you also have organics (algae, etc.) in the water.