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It is unnecessary to use the algaecide if you have a proper sanitizing system. Bromine tablets are better than chlorine for hot tubs.
It is unnecessary to use the algaecide if you have a proper sanitizing system. Bromine tablets are better than chlorine (which doesn't come in tablet form) for hot tubs.
It's interesting that Sani-Marc makes Dichlor tablets because I didn't think anyone did that, but of course any solid can be compressed into a tablet. As you've seen, it dissolves quickly so it's basically the same as adding Dichlor granular to the spa.The main problem with Dichlor is that it builds up CYA in the water and since the active chorine level is proportional to the FC/CYA ratio, there is less active chlorine over time and the oxidation and disinfection rates drop as a result.What is the size in gallons of your hot tub? The standard Water Replacement Interval (WRI) formula converted to person-hours is the following:WRI (days) = (1/9) x (Spa Size in Gallons) / (# of person-hours per day)So if you only had a 350 gallon spa then that would be (1/9) x (350) / (2*(25/60)*(5/7)) = 65 daysSo you may have a larger spa size if you aren't finding the water getting dull in that time. Either that or there are other parts of the Sani-Marc system you are adding to help keep the water clear (perhaps enzymes). If you were to use the Dichlor-then-bleach method, then you could expect to keep the water clear for at least twice as long or 130 days (over 4 months) and it would be a lot less expensive, but if you are happy with your system and don't mind what you pay for it, then stick with it.
ALL forms of chlorine add salt because when the chlorine is used/consumed it becomes chloride salt. The difference is that with Dichlor it also adds Cyanuric Acid (CYA) while with bleach it does not but adds additional salt upon addition. For every 10 ppm FC added by chlorinating liquid or bleach (or lithium hypochlorite as well) it also increases sodium chloride salt by 16.5 ppm after accounting for chlorine usage/consumption. With Dichlor, for every 10 ppm FC is adds 9 ppm CYA and 8.25 ppm sodium chloride salt after accounting for chlorine usage/consumption. The CYA buildup is worse than the salt buildup since 100 ppm CYA is significant while 200 vs. 100 ppm salt is not.