How hard is it to change out this part?

Does this say it still has 80% of its life? That seems strange after 4 years.
As @Newdude points out, this is not explained well enough in the manual. But I take it to mean you've used at least 80% of the cell's life. Or somewhere between 80-99%. As I mentioned, I would start thinking about a replacement, and keep whatever is left in the old one as a backup. You'd use the new one while it is under warranty.

More importantly, I can't imagine the price of this thing going down any time soon (read: not ever), and might be one of the many products that are going to have a huge price increase in the next few months (just my opinion). They might also be subject to supply-chain issues, which might mean not being able to get one right away after your current one poops out. For all those reasons, if it were me, I'd buy one right now.

Or think of it this way. An SWG has all the chlorine it can produce "stored" inside. But unlike liquid chlorine, it doesn't degrade in a few months. You'd be buying your future chlorine at today's prices. Sure, it's speculation, but, IMO, I think it's a sound investment, one that potentially could have a really great ROI.
 
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And yes, they're supposed to be "right-side-up," where the text is reading left to right. But you can't just rotate it in place, you'd have to reconfigure the plumbing to honor the flow arrow. If you post a pic with more of your pad showing, we might be able to suggest an easy fix, maybe even a DIY one.
 
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As @Newdude points out, this is not explained well enough in the manual. But I take it to mean you've used at least 80% of the cell's life. Or somewhere between 80-99%. As I mentioned, I would start thinking about a replacement, and keep whatever is left in the old one as a backup. You'd use the new one while it is under warranty.

More importantly, I can't imagine the price of this thing going down any time soon (read: not ever), and might be one of the many products that are going to have a huge price increase in the next few months (just my opinion). They might also be subject to supply-chain issues, which might mean not being able to get one right away after your current one poops out. For all those reasons, if it were me, I'd buy one right now.

Or think of it this way. An SWG has all the chlorine it can produce "stored" inside. But unlike liquid chlorine, it doesn't degrade in a few months. You'd be buying your future chlorine at today's prices. Sure, it's speculation, but, IMO, I think it's a sound investment, one that potentially could have a really great ROI.
We actually have one because we thought it quit. Now my husband wants to try to return it even though I told him the advice from here to keep it. I'll bring up that the price is only going to go up. Saving money is a huge incentive ;).