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Worried about bleach damage to shell


CanadaGirl
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Hello everyone,

We bought a Caldera Geneva spa a few months ago and have been more than pleased with it. We also bought a drop test kit as recommended here. 

We started out on dichlor only but quickly ran into issues of high readings and potential over stabilization. As a result we switched to dichlor then bleach on our water change about 3 weeks ago.

Got our CYA to 30-40ish based on measuring a fixed amount of dichlor the switch to plain 8.25% bleach.

Bleach is added slowly with the the water running.

Noticed today that the area where I normally add the bleach (in middle as much as possible but really over lounger) there is a rough patch. Worried I’ve damaged the shell from the bleach! I didn’t think this was possible, but maybe it settled there?

Our water chemistry is as follows:

CH about 100

TA: 40

pH: 7.5 and stable

CYA: 40ish

Any advice is welcome! I don’t want to switch back to dichlor but don’t want to risk damaging our new tub either.

Thanks in advance.

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