We suggest that you just use plain unscented household bleach for your source of chlorine instead of the shock. In your pool, each quart of 6% bleach will add 1ppm of chlorine. Test as many times per day as you can and each time, add enough bleach to get back up to about 10-12ppm. Try and sustain the high cl reading to kill the algae. It may take a few days of doing so. Continue this until your pool is clear and you can go from sundown one evening til within 2 hours of sunrise the next morning without losing more than 1ppm of chlorine. At that point, I'd keep the chlorine high for one extra day for added insurance. Then, you can let the chlorine drift down and keep it between 3-6ppm all the time so you won't get algae again. Run the pump 24/7 while you are trying to clear the pool.
You need some CYA in the pool as well. It is sometimes called stabilizer or conditioner. Check the label ingredients. If it says cyanuric acid or isocyanuric acid, it is the right stuff. Add 4 lbs. of it to an old sock and hang it in front of a return jet. Give it a squeeze once in awhile to help it dissolve faster. That amount plus the little bit you have in there now should take you to somewhere around 40ppm which would be a good level. Do not use any trichlor pucks or any dichlor shock powder as those contain CYA and will cause the level to rise even further.
Now, having said all that, I just remembered again that you said you had some "shock." What is the ingredient in it? Don't add it just yet but tell us the ingredients. If it IS dichlor, then we may suggest having you use it since you already bought it and then adjust the recommended amount of CYA to put in the sock. And, then you can switch to using bleach after that. But first tell us what it is before we make that decision.
Until your good test kit arrives, you can force your kit to go higher with a dilution method described below. It is not super accurate and not meant to replace a good kit, but it is better than nothing. Testing Without a Good Kit
Hope this helps.
What kind of pool is this? What type of filter and what size is the pump?

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