Thank you so much for this info. I didn’t realise that you could change it to volume.
Adding calcium chloride by volume means use a measuring cup, right?
- Thread starter Skenn81
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Thank you so much for this info. I didn’t realise that you could change it to volume.
Hmm, I’m only getting the option of weight. Grams/Kilograms/ounces/pounds. I might empty a 4 kilo bag into a 10litre bucket and see where it fills to.
Second 64 oz added this morning.
One thing people have said is that you need to sweep it right away when adding. After I added it and watched it floated 8 feet down, there was nothing left by the time it got to the bottom. What am I supposed to be sweeping? I moved the brush around the area anyway for the heck of it, but it was all dissolved within seconds of spreading it directly into the water.
One thing people have said is that you need to sweep it right away when adding. After I added it and watched it floated 8 feet down, there was nothing left by the time it got to the bottom. What am I supposed to be sweeping? I moved the brush around the area anyway for the heck of it, but it was all dissolved within seconds of spreading it directly into the water.
I'd say its safer to sweep something you can't see, than to later find spots in your pool that you wonder how they happened?
Maddie
Maddie
It doesn't always dissolve right away. Even if it looks like it all dissolves, the calcium drops to the bottom and creates a layer of very high concentration.
You should always brush when adding any chemicals unless you get super good mixing, like when you pour a liquid into the return stream.
You should always brush when adding any chemicals unless you get super good mixing, like when you pour a liquid into the return stream.
Hi, Skenn81. I had to raise CH for the first time in a long while recently too, and I had the same question, plus I wondered how volume differs if you buy pellets or flakes. I bought 94% pure anhydrous CaCl pellets. The first time, I measured half as much as the pool calculator said in a convenient liquid measuring cup and pre-dissolved it in a very deep, thick bucket. I used the pool calculator to back into how much that volume of CaCl might have been expected to raise CH. The calculator predicted I would have gotten an increase of about 23% more than I actually got from the pellets.
After observing the exothermic reaction on my first addition, I thought I could probably get away with just expressing pellets over the deep end. I added about half as much the second time this way, not brushing it in. There was no measurable change in CH, but we got a lot of rain before I retested, and I'd been draining a bit and using rain to dilute CYA, which would also have diluted CH by some small amount. Still, that taught me that expressing and not brushing was probably a mistake.
My conclusion is that 1) measuring pellets in a liquid measuring cup will probably give you less CaCl than anticipated in the volume measure listed on the pool calculator, but since you want to start by adding too little and adjusting up as necessary anyway, that's not a problem, and 2) I safely got good results dissolving pellets in a large, thick bucket in plenty of water before adding near a jet in the deep end while the pool was running. If I had not had such a sturdy, deep bucket, expressing and brushing would seem the safer way to go given the heat produced by the reaction with water.