If you depend on water exchanges to reduce or eliminate DOCs then your filtration isn't up to snuff IMO
, but the vast majority roll that way I know. Using a ATS, my organic load stays very low without exchanges. Using Triton I get a exact view of 31 different essential elements. I monitor and replace those and all runs just fine. For most average hobbyists with smaller systems and no degree in chemistry
, water exchange is all you need, but for larger systems, replenishment also works. No crashes after 24 years, so I guess it works. But to make it work, you need a certified lab doing a broad range of calibrated tests, not home type testing. That is earlier where I almost went wrong in the whole thing, you have to test for a lot of different key elements.
I have a very heavily loaded system full of Stoney corals. I found out that:
Calcium was being depleted very, very rapidly along with Mg
. Alkalinity was also being under dosed.
Lithium gets high without water exchanges.
Potassium gets depleted.
Iodine and Strontium as well as a few others gets used up fast.
A tiny, tiny bit of copper accumulates (Cuprasorb fixed that).
The Potassium was the big surprise. That's the result of running a ATS I think.
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