Jan gave you some suggestions for good test kits that you should consider buying. But, you need something now so you will probably need to buy something cheap to use until you can get a better one. Walmart used to sell some "5-Way"kits that would do but honestly, I haven't looked at what types of pool supplies they are carrying these days. You need something that can measure the cya level. Maybe your pool store has a kit that will. You also need to be able to measure two of the following three: free chlorine, combined chlorine and total chlorine. Since FC + CC = TC, if you have two of the readings, you can calculate the third. If you cannot find any kits locally that can measure cya, your last opinion would be to take a water sample to a reliable pool store and ask them to measure: FC, CC, TC, ph, alk, and cya. JUST DON'T LET THEM SELL YOU ANY CHEMICALS! Unless your cya reading is 30 or below. If it is, then buy a container of cya (cyanuric acid, also called stabilizer). You're going to also need a lot of chlorine. Just buy plain household, unscented bleach. Generic is fine and it is what most of us use. A lot of us buy the generic stuff at Walmart.
Get your numbers and then we can help you get this cleared up. By the way, if you do buy cya, do not broadcast it around the pool like the label directions may tell you to do. Get back to us with more info and somebody here will advise you on how to add the cya and also how to tackle the algae.

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