OK then.
Scoop out as much debris as you can and unplug the frog. We don't think too highly of those units.
Start with adding 10 gallons of 6% bleach. That should take the cl reading up to about 16ppm. (Don't have to be so conservative since it is a gunite pool.) Test as many times per day as you can and each time add enough bleach to get back up to somewhere around 15ppm. For reference, in a 38K pool, each gallon (4 quarts) of 6% bleach will add about 1.6ppm of cl. If you have somewhere that sells 10% or !2% liquid sodium hypochlorite for a good price, that would probably be easier than 6% and fewer jugs to deal with.
Run the pump 24/7 and backwash the filter when the pressure rises 5-10 psi over clean filter pressure. Brush the pool as often as practical to help rid it of the algae.
Also, work to lower the pH with muriatic acid. Start by adding a couple of pints slowly in front of a return jet. Wear gloves, glasses, stay upwind of fumes, pour close to the water to avoid splashing. After a few hours, retest pH and redose until pH is somewhere between 7.2-7.6.
You also need some stabilizer in there. 11 lbs. will give somewhere around 40ppm of CYA. Since there is so much algae and you'll have to backwash frequently, it will be best to put the stabilizer in an old sock and hang it in front of the return jet. Keep the pump running 24/7 and give the sock a squeeze once in awhile to help it dissolve faster. I doubt you'll be able to put it all in the sock at one time. A week after it is added, test the CYA level but not before or you'll just waste the reagent. Move the sock before adding other chemicals.
Hope this helps you get started. What a good guy (gal?) you are for helping her!
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