Add Astral Pool Halo Chlorinator

[unixorn]

Description

Add Astral Pool Halo Chlorinator

Type of changes

• Add/update an entry
• Text cleanups/updates
• Test updates

License Acceptance

• This repository is Attribution-NonCommercial-ShareAlike licensed and by making this PR, I am contributing my changes to the repository under the terms of the CC BY-NC-SA license. See License for more details.

Checklist

• I included a description and/or links in the new entry's garbage column describing why it is garbage.
• All new and existing tests pass.
• I have confirmed that the link(s) in my PR are valid.
• I added my entries in alphabetical order
• My entry is a single line. This makes it easier to keep the list sorted since we can use our editor's sort feature instead of having to manually move multi-line stanzas around.

Cosmetics

Please keep the entries in alphabetical order. Once the list gets larger, that'll make it easier for people to find things.

Make each entry a single line in the table. This lets me sort entries more easily since I can just use an editor's sort function instead of having to manually move entries around.