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You can always get a full test on your water, and use 100% of the nutrients it has; no filter needed. People use RO filter, not because their tap water is bad to use, instead, it levels the baseline for the bottled nutrients they add. If you understand how to use the tap water's nutrients...

The reason for a yoyo effect in your pH is the carbonates of the tap water. ...let me explain, Carbonates = high pH If a more acidic solution is mix with tap water with carbonates in it, the carbonates dissolve over a couple hours. Since carbonates are alkaline, the pH of the total solution...

My target calcium is approximately 100-125ppm. My city tap is more than adequate for that. I rarely show calcium deficiencies.

Mostly tap water. Edit: ...but I have a do have calcium sulfate as backup, and I do use DE foodgrade, for bug control.

... lol...I make home made DIY urea.

I use 100% urea for nitrogen, in my hydroponic (soil-less) aquaponic system. My last harvest was 1.45gpw. No 2 gardens are alike. I don't use Calcium Nitrate.

I prefer using a combination of all that I listed, but I find predatory nematodes work best. It also depends on your individual garden setup. I'm an organic hydro-like garden, so..

Yes, thrips. Anything with spinosad will work including Cpt. Jacks, neem oil, ionic water with soap (i.e. mighty wash), amblyseius cucumeris, predator nematodes, ladybugs, praying mantis. Google is your friend...

A little tip on carbonates... Don't measure your pH right away, when using adjusted pH'ed tap water. As tap water becomes more acidic, the carbonates within dissolve. As the carbonates dissolve, they make the water more alkaline, and drive the pH back up. This is known as the yoyo effect. This...

...A lot less. While fish can handle hundreds of ppm's of nitrates, fish can die with less then 10ppms of ammonia or nitrites.

Ouch, yup, that sucks. Sounds like an expensive mistake he'll only do once.

Citric acid is an antimicrobial compound, so it kills the nitrifying bacteria. When doing so, ammonia and nitrite levels spike. Both ammonia and nitrite NO2 (not to be confused with nitrate NO3) are very poisonous to fish. ...so yes, citric acid will kill the fish.

Yup, closed loop aeroponic, aquaponic system, ...with soil.

Blue lab is set to 35% phosphoric acid in their pH down, and what I prefer, when used. Unfortunately, aquaponics and citric acid don't play well together. :(

GH is "Scott's Brand" I'm not a fan. ...and I believe its just phosphoric acid dilute.

The pH is lowered as a result of carbonic acid.

I assure you, it's correct, and it works very well in my system.

Brad's wife said the same thing, and look what it got her.. #justiceforbradswife

My target level of Cl is actually higher than you'd think, about 100-110ppm. If I use phosphoric acid, I'd have to add a bottle at a time, as it's generally too diluted, and very expensive. It'd also make my "P" off the charts. Nitric acid would also make my N way too high, as my target for...

I just pour it in, but I'm working with 1300+ gallons in my reservoir. It take about half a cup to 1-2 points pH.