You need to post a complete set of water testing results for us to really be able to advise you. (FC, CC, TC, PH, alk, calcium hardness and CYA) If your kit doesn't test for all these, give as many as you can, but we especially need to see a CYA reading. To make your test kit test higher cl levels, you can dilute your sample. Take one part pool water, and mix it with one part distilled water, test as usual and then multiply result by 2. If you need to go higher, one part pool water, two parts distilled, then multiply by 3, etc. With each dilution, you lose some accuracy, but it is better than nothing. You can buy a kit that tests higher than 5 at the sister site to this forum. www.poolsolutions.com

We also need to know the volume of your pool and if it is vinyl, fiberglass, gunite, etc. Welcome to the forum.