The Hot Spring Spas Ace Salt cell that came with my 2014 spa is nearing the end of its lifespan and will need replacement soon. It has been working well, but a replacement cell costs ~800$ and I have to use their Vanishing Act bag at around $50 per fill to reduce the calcium level to ~50ppm (anyone know what is in this mysterious bag?).
In my previous hot tub I used a Colorchlor (aftermarket drape-over salt cell) with excellent results. The same company now manufactures a "Deuce" cell which is a direct replacement for the Ace cell, at a cost of $500. It seems to have good reviews.
Pros: Incorporates boron doped diamond (BDD) technology to improve sanitization (no this is not a gimmick - it has a proven track record in wastewater treatment)
Cons: High cost of electrode and requires calcium reducing bag for each fill.
Pros: Much cheaper. Don't need to reduce calcium level
Cons: No BDD.
Does anyone have any ideas/experience on which cell to buy? I am not looking to get rid of the salt system - it works very well for me, even if it has had mixed results for other people. It reduces my maintenance significantly.