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Topping Off Spa Water


Deedee2604

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I am using the dichlor then bleach method. I had to top off my water because the water level got a little low. I shocked to 10 ppm FC after adding the additional water. I rechecked all my levels, but forgot about CYA. When I tested it was below 30, but still had some CYA since the testing water was cloudy. I think I am still okay?? I will add a little dichlor next time to raise CYA to 30. Also, does anyone add additional borates after topping off the water?

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With dichlor-then-bleach you do still need an occasional dichlor dose. CYA seems to get "eaten" very slowly by the chlorine, I think the rule of thumb is 5ppm per month.

I've not heard about borates going away over time. Technically, if you lose water over the side (too-vigorous splashing, or just people getting out all drippy wet) that would have a net effect of losing some borate, but in most practical situations it wouldn't be enough to bother about.

(Say you started at 30ppm borates in your 300 gallon tub. If you heaved 30 gallons over the side, then topped up, you'd be down to 27ppm borates. Not enough to notice.)

--paulr

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