You're asking for help from experts, but you're also asking them to guess ... Here at TFP, the experts will not guess, but will provide help when the data they need to know to do so, is known.
Without accurate test results, any solution to your problem, and ... even the problem itself ... would be pure guesswork.
Marty wasn't offended, but is reacting to you asking him to guess at a treatment plan without having the info he needs to provide one. The experts here are too mature to be so easily offended.
This place will provide you with the most accurate info anywhere, due to the TFP methodology being based on proven science. The experts here are well versed in their respective fields, and the result is a methodology which works very, very well ... and does so with minimal $$ and time requirement.
Pool store testing is not accurate, and neither are test strips ... at least not accurate enough to support the TFP methodology. This website isn't a "general pool care help forum", but is specific to the TFP methodology; which in my opinion, is the absolute best approach to pool maintenance.
The past year has cost me about $200 in total cost, and about 30mins a week, to maintain perfectly clear water in my salt pool through the TFP methodology. If I were following the pool store methodology, I could probably add another 0 to the end of the $200 number, and most definitely add a bunch more time; not only driving back and forth to the pool store, but the time adding potions into the water ... never mind the lost swimming time due to having a green pool.
Get a good test kit, take a full set of readings, and post back with the results. The guys here will give you the best advice and guidance anywhere on the net. If you follow the TFP approach, you will have a very troublefree pool, which cost you a few hundred dollars a year to maintain
In terms of your white flakes ... I experience them in my salt pool as well, but it is not scaling in the cell. Mine are due to the moss rock around my coping. The chlorine bleaches the moss, and it falls into the water periodically, and floats on the top. I' not saying yours isn't calcium scaling inside the cell, just pointing out there can be other causes for this sort of thing. The test results will guide the experts into giving you great advice on it though ...