OK. We'll work with the 25ppm CYA, and let you correct that once you have the K2006.
50# = 50lbs. The Sams' buckets are 50# of dichlor, and 40# of trichlor. The "shock" is EXACTLY the same thing as the dichlor bucket.
It's possible that it would be best, if you could return some of those chemicals -- if you use all of everything this year, your stabilizer will be high enough to be an issue. Or maybe not. It depends on how you want to run your pool.
If you haven't opened anything, open either the shock or the dichlor, and start adding 4 lbs -- 8 of the little cups -- of dichlor per day. The best way is to add it to the skimmer -- assuming NOTHING else is in there, except water! Your pH and alkalinity will start going down, as you use the dichlor. Don't worry about (or even test!) the calcium, alkalinity or CYA again, for awhile. But do test your pH, and don't let it go below 7.0. When it gets near 7.0, start adding borax along with your dichlor, one box at a time.
If you got a cheap OTO / phenol red kit, you can use it and only use the K2006 every 2nd or 3rd test.
Let me ask some questions, since the best way to proceed depends on your answers. Please send in answers to these questions:
+ What are your pool's dimensions (at least, length and width)?
+ What is the make and model of your filter and pump?
+ Do you have any sort of feed system -- mineral, trichlor, SWCG -- that plan to use?
+ When do you (or your family) want to start swimming? (ASAP, next week, in May, etc.)
+ Are your pump and filter running, and working normally?
+ You have stains, now? Where, and what color?
+ You indicate you think you have too much metal in your pool water -- are you adding metals to your pool ('minerals', algaecide, what?)
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Assuming 40K gal is correct (give us dimensions, if possible, so we can confirm -- a LOT of people are told the wrong size on their pools), your pool is 1/3 of a millions pounds of water . . . which means 1# of something that's 100% active will give you 3 ppm of that thing in your pool. For example, 1# of chlorine gas will add 3 ppm of chlorine to your pool; 1# of trichlor will add 2.7 ppm (3 x .9).
So with (((50 + 24) * 0.55) + (40 * 0.9)) * 3 = 230 ppm of chlorine in your pool (if you added it all at once)
And since both add stabilizer: ((74 * 0.5) + (40 * 0.55)) * 3 = 177 ppm CYA
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