Chlorine Trichlor (Tabs)
Trichlor (trichloro-s-triazinetrione, chemical formula Cl3C3N3O3) contains the highest percentage of available chlorine of all the types of chlorine compounds. Trichlor is produced by drying and cooling the sodium salt of cyanuric acid in the presence of chlorine gas. The resulting compound Provides 90-percent available chlorine.
Trichlor is mostly available as a l-inch tablet, 3-inch tablet, a stick or a cartridge. It has a long shelf life, and it is very slow dissolving, so it works extremely well in floaters and erosion-type feeders. It can be used for regular chlorination but not for superchlorination, because it dissolves too slowly.
Because use of trichlor can cause a build up of cyanuric acid in the pool water, it is necessary to check the cyanuric acid level more frequently and to partially drain and refill the pool if the level exceeds 100 ppm.
The pH of trichlor is 2.8-3.0, so it causes an acidic condition to occur in the pool -- that is it It is therefore necessary to add about 4 1/2 ounces of soda ash for each pound of trichlor used.
Because trichlor already contains cyanuric acid, it does not require addition of that chemical (Chlorine Lock)
REQUIRES adjustments to the alkalinity level more than bromine because of the pH of the chlorine but offers clear water with very little turbidity when the jets are on high.
One-part bromine or bromine tablets are actually a compound of bromine and chlorine (1-bromo-3-chloro-5,5-dimethylhydantoin also called BCDMH), (chemical formula BrClC5H6O2N2,). The chlorine in the tabs is used to oxidize the bromine to produce hypobromous acid and hypobromite ions. Bromine tabs provide an available bromine level of about 2/3 or 61-65 % and an available chlorine level of about 1/3 or 27-31%.
One-part bromine (BCDMH) is mostly available as a 1-inch tablets, cartridges or packets. It has a long shelf life, and it is very slow dissolving, so it works extremely well in floaters and erosion-type feeders.
However after the hypobromous acid destroys bacteria, algae or other organisms, or is destroyed itself by sunlight it returns to being bromide ions, which can be reactivated by adding an oxidizer. The hypobromous acid can also combine with ammonia and nitrogen compounds in the water from swimmers to form bromamines. However, these bromamines are active sanitizers, and they do not smell like their foul-smelling counterparts – chloramines.
Although bromine itself is an oxidizer, it is not strong enough by itself to oxidize or destroy ammonia and nitrogen compounds in the water. It is therefore necessary to oxidize these swimmers wastes and reactivate the bromide ions by adding a stronger oxidizer -- usually any form of chlorine or a nonchlorine shock (potassium peroxymonosulfate).
The pH of bromine tabs is 3.6, so it causes an acidic condition to occur in the pool -- that is, it lowers the pH. It is therefore necessary to add about 3 1/2 ounces of soda ash for each pound of bromine tabs used.
REQUIRES less adjustments to the alkalinity level chlorine because of the pH level but can cause fuzzy water clarity and turbidity when the jets are on high.