I think that is based on 10,000 gal., so it would add 75?
I think that is based on 10,000 gal., so it would add 75?
Northeast PA
16'x32' kidney 16K gal IG fiberglass pool; Bleach; Hayward 200lb sand filter; Hayward pump; 24hrs; Pf200; well; summer: none; winter: mesh; ; PF:7.5
sonofthebeach is correct. Two 8 ounce pucks is one pound and one puck in 10,000 gallons increases CYA by 3.3 ppm. So in 23,000 gallons,
(2 pucks/pound) * (50 pounds) * (3.3 ppm/puck-in-10,000-gallons) * (10,000 gallons / 23,000 gallons) = 144 ppm CYA.
or 50 pounds of pucks is 100 pucks and this would add 330 ppm in 10,000 gallons so in a larger pool it's less so 330 * (10,000/23,000) = 144
This assumes no dilution from splash-out or rain overflow or backwashing.
Richard
I seem to stink at math too RichardOh well, at least I can cook
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Northeast PA
16'x32' kidney 16K gal IG fiberglass pool; Bleach; Hayward 200lb sand filter; Hayward pump; 24hrs; Pf200; well; summer: none; winter: mesh; ; PF:7.5
Richard, indulge me please.
So let's check DH calculations. Using 7 oz pucks in 27038 gallon pool. He figured 15 pucks.
Using your formula, I get 2.789724515 ppm/lb in 27038 gal pool and therefore need 3.5845833333333 pounds of pucks to get a 10ppm increase.
Which means 8.19 pucks.
Don't want to put you in the middle but......................
Last edited by Jakebear; 07-05-2007 at 10:25 AM. Reason: addition
27038 Gallon InGround, Vinyl, DE filter.
The formula is about 3.3 ppm CYA for 8 ounces in 10,000 gallons. So,
3.3 * (7/8) * (10000 / 27038) = 1.07 ppm CYA per 7-ounce puck in 27,038 gallons. The accurate calculation gives 1.08 ppm CYA (the 3.3 was rounded).
I'm not sure what you were looking for.
Richard
At 1.07 ppm CYA/7 oz puck it should take ~ 9.3 pucks to raise it 10 ppm. We have put 12 pucks in and have not seen the CYA budge. Tests this AM were:
pH 7.4
FC 3.6
CC 0
TA 90
CYA <30 ppm
Temp 83
All with Taylor 2006 kit
Maybe the CYA was lower than we thought (22) to begin with. I just want to "quit with the pucks already" --- they make a black scum ring around the pooland I didn't have that when the CL Pump was in use.
I sure wish there was a different test for CYA -- I just got off the phone with them --- NOPE --- unless you go electronic colorimeter (Taylor doesn't have) and it is still turbidimetric.![]()
27038 Gallon InGround, Vinyl, DE filter.
Though Trichlor is cheaper, a faster and more efficient option for adding CYA is Dichlor. At least it dissolves right away. Anyway, I found that using Trichlor in my own pool took a little more than I expected to get the CYA to rise, but the turbidimetric test is clearly not precise visually and is probably quite prone to error at the lower CYA levels where other turbidity of the water itself would become even more important.
CYA presumably adheres to pipes and pool surfaces, at least somewhat, so some that gets added probably doesn't get measured in the water test.
Richard
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