For pool owners only... the best swimming pool calculator on the Internet.
As with anything extremely lucratively marketed, residential outdoor pool maintenance information on the net is fraught with very bad (and just plain dead wrong) advice - to the point that almost everything you think you believe about pool chemistry - is highly likely to be wrong.
For example, don't believe a word told to you by pool stores, as almost everything they sell is not only unnecessary - but has negative impact.
With that in mind, I've found accurate chemistry dosing information for the outdoor residential pool homeowner, in the Orenda online offerings.
Free login-free ad-free iOS & Android pool calculator (requires GSF):
Over 150 residential pool-owner accurate scientific podcasts:
Outdoor Residential Pool owner accurate Pool Chemistry Blogs:
Ask technical questions of Eric Knight and the Orenda team: snipped-for-privacy@orendatech.com &
Free Orenda Academy pool maintenance online class:
Register for the free Orenda Academy pool maintenance online class: