So I cleaned, drained, and re-filled my hot tub. Just waiting for it to heat up before adding anything right now. (Cold outside, water was 45F when filling)
After getting itchy rash, experiencing way too high CYA, trying to lower ph, I want to switch the dichlor & bleach method but have a few questions:
I read the sticky on how to do this, but still can't grasp some stuff:
"On a fresh fill use Dichlor until you get to 20-30 ppm CYA. (10 ppm FC = 9 ppm CYA)
Then switch to Clorox Unscented 6% bleach.
Never let FC drop to Zero for any length of time. Keep it between 3-6 ppm normally, min of 1 ppm, and shock to 12 ppm once a week."
1. So on a fresh fill, my dichlor granules "Boom" bottle says to put in 30g for my 1500 L /400 gallon hot tub. But should I ignore that and just put in the 14g as recommended by the PoolMath calculator to get 5 ppm? Or should I just pump it up to 10ppm right away?? Is it a good idea to shock it right off the bat?
2. So I keep adding dichlor until I'm sure I've added around 20 or 30 ppm of CYA (28 ppm of FC), then start using bleach only. Or do I? Do I "shock" weekly with the bleach instead of the granules? When I do, do I have to "gas" off the chloramines by having the jets run and the top off?
3. The bleach calculation on the calculator is a bit weird. What does the "of blank field weight %" mean? It seems that one can put whatever they want in the field before the "% bleach"...and not sure what the jug size would help? Or should I ignore the rest and only read the ml quantity after the "Add"?
4. The bleach, I'm assuming it can't be the "concentrated" kind, just regular unscented bleach?