# Is the LSI actually an "Index"?

Page: https://stenobird.com/podcast/rule-your-pool-478192/is-the-lsi-actually-an-index
Text version: https://stenobird.com/podcast/rule-your-pool-478192/is-the-lsi-actually-an-index.md
Podcast: [Rule Your Pool](https://stenobird.com/podcast/rule-your-pool-478192)
Published: 2026-05-06T13:00:00+00:00
Episode link: https://rule-your-pool.simplecast.com/episodes/is-lsi-an-index-0U_u62t_
Audio file: https://cdn.simplecast.com/media/audio/transcoded/4555a2a2-d4a0-4228-a011-c217dfa15a10/0d7ce148-ec8f-4095-833e-ebe7fb3ab092/episodes/audio/group/176326ab-a445-498c-a96e-9f05011fc275/group-item/84350966-f6ca-42b3-a0c1-dbcb8e00c5e1/128_default_tc.mp3?aid=rss_feed&feed=ZhC_J4WB
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JSON: https://stenobird.com/v1/public/podcasts/rule-your-pool-478192/episodes/is-the-lsi-actually-an-index
Duration seconds: 686

## Resource

A listener emailed the old ruleyourpool email address (the new one is ruleyourpool@gmail.com) and brought up something interesting. He said "Nowhere in your RYP podcasts have I heard you mention that the LSI is not an index. It's a delta between the saturation pH and the current pH. LSI is the difference between the pH you have and the pH your water wants." Let's discuss this.

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## Transcript

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