Yes! Get a test kit ASAP! Even a $7 OTO/pH drop kit will help!

If your pH is below 6.9 it can damage your pool. If you cannot measure below the lowest reading in the kit, it's TOO LOW! If so add 1 box of 20 Mule Team Borax (that's right, Borax) and wait 6-12 hours, measure your pH again, wait, measure, until ph is above 7.3 (but below 7.8). Your Total Alk will surely be lower then as well.

Next, you need to dump in 6 gallons of regular 5.25% bleach, NOW! Within 6 hours, I'll be chlorine will be 0 and you'll need to add another 6 gallons (or 4 LARGE bottles of 6% ultra bleach). You want your chlorine level to go to 15 and keep it there until your water clears.

I'd rather see you get a better test kit--check the kit at PoolSolutions.com or the FAS-DPD kit from Leslies web site.