Copper test strips & electrode brush
Sunrock > Chest 1
A 30-count bottle of copper pool & spa test strips plus a small stiff wire brush for maintaining a solar pool ionizer. The strips read copper concentration; the brush scrubs mineral buildup off the ionizer's copper anode.
Spa Essentials Chlorinating Sanitizer
Sunrock > Plastic sheds > Shed C
Chlorinating concentrate sanitizer for spas and hot tubs, in original lidded canister.