OK3, I just want to clarify whether you'd like further assistance, and make sure you understand why this particular forum may not be able to offer it if you're relying on pool store readings. Because we'd LOVE to help you, but our hands are kinda tied when a poster follows typical pool store advice.
That's because the founding principal of TFP is based on science that shows keeping FC at 7.5% of your CYA level will eliminate algae problems. But most pool store products except liquid chlorine are stabilized products, meaning they incrementally add CYA...which makes it a moving target.
In addition, cya testing is difficult even poolside with the recommended kit, and notoriously inaccurate at most pool stores.
So to diagnose problems, we always need to know first that the FC ratio is correct as a baseline. And we can't do that in good conscious with any other test
With SWG there are a variety of things to look at, including age of cell, sizing for pool, salt levels, current, etc. There are also a variety of things that create a high chlorine demand, including nascent algae and even things like antifreeze getting into the pool on opening if lines are flushed back into the pool.
If you raise your FC with liquid chlorine repeatedly until it holds at its recommended level (if you had a proper test kit) you would be able to rule out nascent algae, or oxidize any chemical fighting your chlorine, etc. You are then in a better position to diagnose, or ave us help diagnose, what's going on.
Have a read through
Pool School to see what you think about our maintenance approach before adding the Easy Pool.
While I don't doubt your guys are honest and believe in their system, which is in the interest of the mfgs that sell to them to promote, at the end of the day I'd rather teach you to fish than give you a fish. The pool store guys are giving you a fish, and you're paying for it, and the convenience of that is probably attractive, so its your call and we do undrstand. But learning to fish the TFP way empowers you to have a trouble free pool, so I invite your consideration