First of all, welcome to the Pool Forum!
You are going to need a better test kit that can also measure CYA. We recommend the Taylor K-2006 or 2006C that you can get through the test kit link in my signature below.
It would probably be helpful to follow our 'recipe' for starting up small pools. Take a look at the sub-forum called 'Pool Chemistry for Intex-type pools and read the second thread with the 'recipe' in it. Until your registration is completed, you will need to log out first to be able to see the rest of the forum.
I'm not sure what the cause of the yellowish water could be. What was your source of water when you filled the pool? You need to be running your pump and filter way more than 4 hours in 2 days. Probably more like 8 hours per day which you can split into two 4 hour sessions. However, while you are trying to clear the pool up, you should run it 24/7.
Do some reading on the forum and also on our sister website www.poolsolutions.com and then come back when you have more questions.
Hope this helps!
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