We would benefit from help . . . on equipment questions . . . from people with specific experience, or with a pool biz back ground. But, I haven't figured out how to get guys, like yourself, to stick to what they know. The reason is, they usually don't know that a bunch for what "they know" isn't actually true.

For example, you wrote
Sand used in filters should be replaced every year
which is not true, and is a topic covered again and again. If we allow such things to stand, it will result in hundreds of homeowners wasting money fixing things that aren't broken.

Likewise you wrote
(1) Anything that can decay (organic) will release ammonia in water, (2) which is toxic at high levels, at low levels fish wont even survive. (3) Algae consumes ammonia and thrives, (4) eventually ammonia turns into nitrates,
which contains 4 incorrect or misleading statements:
#1. Decay may lead to ammonia (some forms of bacterial metabolysis do) butd it's simply not true that all (or even most) decay produces ammonia. What's more, the results of bacterial decay are relevant in operating pools, since the bacteria are dead.
#2. Not relevant in the least, for pools. Those levels of ammonia will only result when someone ADDS aqua ammonia. (Another topic, not often relevant these days.)
#3. Not true at all in pools, and I'm not sure algae EVER 'consume' (metabolize) ammonia. Nitrates are a necessary nutrient, but that's not the same thing.
#4. Ammonia can be biodegraded into nitrates, but again, that will NOT happen in operating pools, and in any case, it's only one of several possible pathways.
It's precisely this sort of thing which makes it so hard for us to let "professionals" into the forum: they "know" things that aren't so, and we end up working MORE, not less if we let them post. It's very, very hard for pool pros to accept that, at least with respect to pool chemistry, they need to come here to LEARN, and not to teach.

It makes no sense to think that a couple of websites developed by an obscure pool service guy, and expanded and extended, not by people in the pool business, but by pool owners -- that THOSE websites are where pool guys should go to learn about pool chemistry.

So it's reasonable for pool guys to think they know better than the folks here. Reasonable -- but wrong. And unfortunately, that reasonable conclusion leads to collisions that I've never found a way to avoid.

A few guys READ here a lot, before they start posting. And some of them have become very important resources here. But, that's rare.

Best wishes.