Since this will be a fresh fill, there will be no CYA in the water. So, if you want, you can use the trichlor tabs for awhile and let the CYA build up to the level you want. (We usually recommend 40-50 for most people's pools.) Trichlor will cause your pH to fall so you'll have to monitor it closely while you are using the tabs.

Once the CYA is up, the you can switch to an unstabilized form of chlorine -- bleach, liquid chlorine, or cal-hypo. Does your cal-hypo list what the other ingredients are in it? Sometimes they have other things in there that you don't want to add to your water.

Are you going on vacation this summer? If so, you may want to use your tabs for awhile now but not to the point where your CYA is too high and that way you'll be able to use them for awhile when you are away on vacation. They are very convenient for times when you can't monitor your pool daily.

Order the good kit, and pick up the cheap OTO/Phenol Red kit for now. Test the pH of your fill water and report back. Also, tell us what you want to do with your pool. You have some choices.