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Spa draining questions
pwray posted a topic in Hot Tub Water ChemistryWe have had a small (~800L) spa for around a month. Ive begun using the dichlor-then-bleach method today after half-draining the spa to reduce the CYA to close to recommended levels. Questions: 1) How often? The providers said drain every 3 months, but apparently that's too long for a small spa. The Taylor site recommends the formula: Size in Litres / (10 x # of bathers daily) which comes to just 40 days for us. I think we should be able to go longer than that, because we wash with soap first and we are pretty small people. What guidelines do other follow? I'm thinking 2 months. Is there a more scientific way to say when to drain (provided of course the water looks fine and sanitised correctly each day)? Perhaps a total dissolved solids measurement? 2) Draining onto garden? Im using the recommended 50 ppm borates, and I understand that a little is good for plants, but that is going to be a lot of borates over time in the soil. What do others do with the drained water?
Ta, Ph, Ch, And Borate Questions
Bchnit1 posted a topic in Hot Tub Water ChemistryHello all. Thanks for all the fantastic info on this forum. I've learned so much. I just bought my first spa, 500 gal Artesian Island and love it. Had it for 2 weeks and am researching chemistry and sanitation like a mad man to the point of obsession. The spa has an ozonater and the dealer set me up with an initial Spa Frog system. I've got 1 unused bromine cartridge and once it is done I'm dumping the Frog for bromine tabs in a floater (I've researche the 3 partbromine set up system). We have heavy use with teenage kids and friends and the low level of bromine was not keeping up with the bio load. With all the dichlor/bleach additions it makes no sense to spend the money on the Frog IMO. I initially was shocking with MPS and swithched to dichlor. After learning about the CYA I've swithched to bleach since the CYA levels should be more then sufficient now.. I have a good understanding of basic chem and the relationship between TA and pH as I also have a reef aquarium. I understand that borate helps buffer the pH by keeping the alk from dropping. I currently have the following parameters pH 8 TA 90 CH 250 I've got a Taylor K2106 ordered and have been using my neighbors pool test kit . Here are my concerns. 1-Pool calculator states TA should be 50-80. Manufacturer states TA should be 80-140. Is low TA going to affect the spa in any hardware way physically, or only the pH buffering? I have not added boric acid yet until I get the TA proper. 2- Adding boric acid should increase the TA without affecting pH, thereby increasing the buffering capacity, correct? If so I can see why lowering to 50 is ok as the borate will increase TA back up near manufacture's recommended. 3- In order to maintain a sufficient Calcium level TA needs to be at a certain level to be balanced (at least it does in my aquarium) and stop the precipitation of calcium carbonate. Given my Ca level do I need to worry about Ca falling out of solution if I drop the TA further? 4- Once TA is balanced how much borate do I add? I assume there is not much borate in city water. I will be using 20 Mule and muriatic acid. Thanks for any help and suggestions.