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Chlorine Demand is the single most important measurement you can make, to determine the health of your tub water. Any organic "stuff" (dead or alive) in your tub, Chlorine will kill and oxidize. The more "stuff" in your tub, the more Chlorine is needed. The question becomes, is there a...

Hi All, I'm doing research on SWCG's for spas. I've been looking at three portable ones, Spa Pilot, ColorChlor and Nexa Spa. The first two have an output rating of ~15 grams chlorine per day. The last one has a rating of ~100 grams per day. All at 3000 ppm salinity. The last one claims it can...

The problem with lowering Total Alkalinity (TA) in general is that when you add acid to lower TA, pH also decreases. This limits the amount you can lower TA without pH becoming too low. However, there is something you can do to raise pH that leaves TA alone, Aeration. Aeration is the process of...

If you have a question about any information within this Sticky, please start a new thread for yourself where you will receive very quick responses to your specific questions. Thank you! Introduction There are two main things to consider when maintaining your hot tub water, Water Balance and...