dry chemicals from weight to volume?

[NaCLTPool]

Without using a scale, would the following be in the ballpark of being accurate if I want to use volume to add my dry CYA?

1. Using Pool Math, take recommended pounds to add to reach target level and convert to grams
2. Divide grams from step 1 by density (g/cm3) taken from SDS of manufacturer of CYA
3. cm3 = mL
4. Measure mL in measuring cup

 

[PoolStored]

Density of the CYA is going to vary by brand. Do you not have a scale?

1 cup is about 7oz dry weight...but varies by brand.

Safe way of Adding CYA without over adding?

I tested for CYA using the CYA reagent and vial with the black dot on the bottom. I transfered the liquid to the vial and noticed the water was so clear I could see the black dot even if i filled it beyond the graduation level on the vial (30). So this indicates I have at least

www.troublefreepool.com

 

[YippeeSkippy]

<jaw drop> Whoa!! Way too much math for me....prefer the easier route of using PoolMath's "Effects of Adding x Chemical" and my cheap old kitchen scale. I worked it out for you and 16 ounces in a pool of 9336 gallons will raise your CYA level 13, and lower pH by 0.24

 

[JamesW]

PoolMath

Discover the calculator behind the perfect pool, PoolMath. Dealing with pools has allowed TFP to become the original authors of the best calculator on the net.

www.troublefreepool.com

This shows weight or volume.

 

[JamesW]

If you go by volume, you probably need a decibel meter to determine the exact volume of the chemicals or you can estimate from how loud they are.

 

[NaCLTPool]

Density of the CYA is going to vary by brand. Do you not have a scale?

1 cup is about 7oz dry weight...but varies by brand.

Safe way of Adding CYA without over adding?

I tested for CYA using the CYA reagent and vial with the black dot on the bottom. I transfered the liquid to the vial and noticed the water was so clear I could see the black dot even if i filled it beyond the graduation level on the vial (30). So this indicates I have at least

www.troublefreepool.com

The brand I purchased had its density on its own SDS.

I was able to raise my CYA by 20ppm by adding almost 27oz by volume (vs 25 oz weight). The CYA density of the brand I used wasn’t that far off from 1 which made the weight vs volume amounts similar

 

[JamesW]

You have to go by the bulk density.

Reference water density = 62 lb/ft^3 (pounds per cubic foot).

 

[NaCLTPool]

You have to go by the bulk density.

Reference water density = 62 lb/ft^3 (pounds per cubic foot).

View attachment 648311

I used .897 g/cm3 which is equal to 56 lb/ft3

 

[JamesW]

PoolMath puts it pretty close to 1:1.