Pumie Pumice Block vs. Other "Stones" for Removing Calcium at Water Line

[GoGrabTheNet]

An older thread (removing calcium, options) where member Ozdiver mentioned he had used the following product to rub off calcium scale on his water line:

Amazon.com: EarthStone PoolStone Pool and Spa Cleaning Block, 3-Pack: Home & Kitchen. Earth Stone Pool Cleaning Block

Wanted to know if you had previous experience with the Pumie pumice block: https://www.acehardware.com/departm...VNx6tBh2XDAyYEAQYASABEgJi_vD_BwE&gclsrc=aw.ds

Hopefully that link works. The big block is hard to come by, unfortunately. The only place I've managed to find it was at Ace Hardware, and it's about 10 bucks a block. Wondering if the "glass block" mentioned is any better.

The Pumie block, which is man-made pumice out of China (go figure) does wear away quickly as well. I have a smaller pool with glazed porcelain tile at the water line. The calcium scale is very hard, undissolvable by muriatic acid, and a line of it, even on one tile, will eat the pumice block for breakfast!

Anyone with experience with both, please chime in! It may just come down to buying a block off Amazon and trying it myself. Thanks in advance!

 

[GoGrabTheNet]

Well, upon further review, the "Earth Stone" block may, in fact, just be pumice (man-made, "recycled" material) just like the Pumie block.

 

[japersichetti]

I have been using Acid Magic to deal with stubborn cal build-up at and just above the waterline. it works great and is not as caustic/dangerous as using muratic acid.

 

[GoGrabTheNet]

I have been using Acid Magic to deal with stubborn cal build-up at and just above the waterline. it works great and is not as caustic/dangerous as using muratic acid.

Thanks for replying! I just watched a video on the stuff, and that's crazy!

However, regular muriatic acid has absolutely no effect on the scale around my pool. It does not react at all.