I have no idea what Boron sodium oxide is or what you have used it for. But, I can tell you that if you have algae, then your chemicals are not balanced.
You need to shock your pool up to about 20ppm if you want to get rid of the algae. Chlorine levels are based on your CYA. More about this connection between the two in this chart:> http://pool9.net/cl-cya/
You have to maintain this shock level until you are able to go from sundown one evening to sunup the next morning without losing more than 1ppm of chlorine and you also have no more than 0.5ppm of CC. By the way in case you don't know, FC + CC = TC. So that means that you have a CC reading of 1ppm. Ideally, you want your CC reading to be 0.
With your kit, you aren't going to be able to measure chlorine readings past 5. But, if you buy the Taylor K1515 add on kit, that combined with the K2005 kit that you already have will in essence give you everything that the K2006 kit (that we recommend to everybody) has. Then, you will be able to measure high chlorine levels.
You can find the K1515 by going through this link that takes you to Amazon:> http://pool9.net/tk/ (The kit will not be available locally.)
In the meantime, go to Walmart and pick up a OTO/Phenol Red kit (yellow and red drops) and use this. The scale on this OTO kit also only goes to 5 but if you use the chart at this link, http://pool9.net/oto-chart/, you will be able to decipher what the colors mean when your chlorine goes past 5ppm. (Your current kit cannot do this as it will bleach out at high chlorine levels.)
Your pH, alk, and CH all look fine.
I would suggest just using bleach for your chlorine. No more chlorinating granules and no more tabs. Those products all have CYA in them, and your CYA is high enough.
In a 25K gallon pool, each 121-oz jug of generic Walmart 8.25% bleach will add about 3ppm of chlorine. You can use that to help you figure out how much bleach you add whenever you test to get your chlorine back up to shock level of 20.
Keep your pump running 24/7 while you are working to clear this and also brush the pool whenever the chlorine is high. What kind of filter do you have, by the way?
Hope this helps. Welcome to the Pool Forum!
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