Yes you need a test kit - a 5-way DROPS based test kit is usually available at Wal-Mart. Taylor's makes a good kit and Ben's kit (available on www.poolsolutions.com).
You will need to post your chlorine level, PH, ALK, CA, and CYA. You can probably take a sample to your pool store for results today- but don't buy anything. Just post your numbers and get a good test kit.
Welcome to the forum - this place has a lot of very good information.
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