Pool rust stain remover/cleaner

Remove stubborn pool rust stains
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updated October 25, 2022

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Print all parts in PETG, 0.2mm layer height. No supports required, but I used a brim for the pole insert as it is tall and top-heavy.

Place a piece of notebook paper over the hole on the rounded side of the block and cover with a sponge, then fasten the sponge with the clips. Attach the threaded tube. Put the pin assembly in the cap tube so the ends protrude from the holes. 

Wearing gloves, pour muriatic acid into the tube. Then attach the cap and insert the assembled cleaner into a standard pool rod.

Press the sponge firmly against the stain to break the notebook paper. Acid will then flow into the sponge. Hold it against the stain for a few minutes. You can move it around a little to help release more acid. 

Other cleaning products could be used in it, I have only used muriatic acid.

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