Formulation and method for chlorinating recreational water
A solid composition comprising: (a) a sodium or potassium salt of cyanuric acid; and (b) a mixture of a tetraborate salt and boric acid in amounts sufficient to produce a pH from 7 to 8. Optionally, the composition further comprises sodium chloride or potassium chloride.
1. A solid composition comprising:
(a) a sodium or potassium salt of cyanuric acid having a pH from 6 to 7.2; and
(b) a tetraborate salt and boric acid in amounts sufficient to produce a pH from 7 to 8.
2. The composition of claim 1 further comprising from 92% to 97% sodium chloride or potassium chloride.
3. The composition of claim 1 in which boric acid and sodium tetraborate pentahydrate are present in a ratio from 1.5:1 to 4:1.
4. The composition of claim 3 further comprising a metal chelating agent.
5. The composition of claim 4 in which the metal chelating agent is EDTA.
6. The composition of claim 2 in which a sodium or potassium salt of cyanuric acid is present in an amount from 1% to 3.5%.
7. The composition of claim 6 in which a sodium salt of cyanuric acid is present in an amount from 1% to 3.5%, and has a pH from 6 to 7.2.
8. The composition of claim 7 comprising from 92% to 97% sodium chloride.
9. A method for providing chlorinated water for recreational purposes by adding solids comprising:
(a) a sodium or potassium salt of cyanuric acid having a pH from 6 to 7.2;
(b) a tetraborate salt and boric acid in amounts sufficient to produce a pH from 7 to 8; and
(c) sodium chloride or potassium chloride;
to a body of recreational water equipped with a chlorine generator, followed by electrolysis of the treated water to produce chlorine.
10. The method of claim 9 in which sodium chloride or potassium chloride comprises 92% to 97% of the solids; boric acid and sodium tetraborate pentahydrate are present in the solids in a ratio from 1.5:1 to 4:1; and a sodium or potassium salt of cyanuric acid comprises from 1% to 3.5% of the solids.
11. The composition of claim 6 in which a sodium salt of cyanuric acid is present in an amount from 1% to 3.5%, and contains from 7% to 10% sodium.
12. The composition of claim 6 in which a potassium salt of cyanuric acid is present in an amount from 1% to 3.5%, and contains from 10.9% to 15.5% potassium.
13. The method of claim 10 in which sodium chloride comprise 92% to 97% of the solids; a sodium salt of cyanuric acid comprises from 1% to 3.5% of the solids; and the sodium salt of cyanuric acid contains from 7% to 10% sodium.
14. The method of claim 13 further comprising a metal chelating agent.
15. The method of claim 14 in which the metal chelating agent is EDTA.