Reverse osmosis (RO) is used to reduce [[Calcium Hardness]] (CH) and/or [[CYA]] in pool water.
...gh a special series of membranes designed to remove things such as CYA and CH from the water.
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==Why do Manufacturers recommend a CH of 200-400 for all pools and TFP has different recommendations?==
Most manufacturers and pool stores recommend a CH level of 200-400, for all pools.
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===Calcium Hardness (CH)===
- Heaters that specifically call for a minimum CH level<br>
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...e amount of calcium ions (Ca2+) in pool water. It's important to note that CH is distinct from total hardness (TH) or general hardness (GH), as these enc
...><ref>https://www.troublefreepool.com/threads/need-some-basic-advice-ta-ph-ch-fc-all-things-chemical.253696/post-2237967</ref>
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...e pool water with fresh water for several reasons, including elevated CYA, CH, high ammonia, a complete algae swamp, maintenance requirements, seasonal c
...mulating CH or CYA. For example, pools in the southwest typically see high CH levels every 18 months or so, ideally like to exchange water in the winter
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...mary and secondary efflorescence. Primary comes from the material (ie, the CH in the pool plaster), and secondary comes from the underlying substrate, th
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You will get a roughly 6-7ppm rise in CH for every 10ppm FC added using cal hypo. Cal hypo also raises pH because it
...ness]](CH) buildup should be monitored over the long term. In time if the CH level is allowed to buildup it could cause scaling on the walls of a pool o
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...t get by with a slightly lower CH, but don’t go any lower than 100. If the CH gets low and you see foaming, it's time to add some.<ref>https://www.troubl
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...01/18/calcium-saturation-index-csi/ Calcium Scaling Index (CSI)] using pH, CH and TA to tell us how likely scale will form. A positive CSI above +0.6 ind
...the high 8's or 9. Water left still for a few months with high pH, TA and CH can form scale on the surfaces which will feel rough.
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*R-0011L CH Indicator - should be deep blue color; any other color indicates it is bad
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...test kit that gets pushed by many larger “pool stores”. It tests pH, TA, CH, CYA VERY well, but it’s shortfall is how it tests chlorine levels. The
...-2006 is a step up from the K-2005 test kit. It contains the same pH, TA, CH, and CYA tests just like in the K-2005, with the upgrade to the “FAS/DPD�
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*CH = Calcium Hardness, dissolved calcium.
**BLUE - CH indicator dye (e.g. Taylor R-0011) is hydroxynaphthol blue.
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*608 oz (38 lb) Calcium chloride anhydrous will raise the CH by 411 ppm.
*806 oz (50.3 pounds) of Calcium chloride dihydrate will raise the CH by 411 ppm.
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...to the bottom of the pool. Flocculent does not eliminate live algae, lower CH, or remove CYA from the water.
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...to 50 ppm or even a bit lower. If you do that, then you need to raise the CH level and pH target to keep the water CSI in balance for plaster pools.<ref
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However, this equilibrium is pH dependent. This is Le Châtelier's Principle ("If the equilibrium of a system is disturbed by a chan
===Raising CH with Calcium Chloride===
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...were balanced to the same parameters; Temp = 70°F, pH = 7.6, TA = 160 ppm, CH = 200 ppm. The tanks were capped to slow down carbon dioxide out-gassing. (
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*For every 10 ppm FC added by Cal-Hypo, it also increases Calcium Hardness (CH) by at least 7 ppm and increases TA by about 0.4 ppm.
...term CH level of 383 ppm, but higher chlorine usage would result in higher CH levels so use of Cal-Hypo is more manageable than stabilized chlorine (assu
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...ge in the Recommended Levels protects your pool surface if the pH, TA, and CH can be kept in the recommended ranges.
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Realize that in Arizona and other areas that have high CH in the fill water, using accelerated evaporation to cool your pool water al
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