Well Water
because you are adding a certain percentage of NEW (fresh, unadulterated) water as the Partial Water Change. In the case that you exhibit, your normal 10% PWC is just that — this new water (10% of the tank’s volume) is considered as your partial water change.
While the 90% remainder of your tank water has sometimes been referred to as “aged water,” especially in the earlier years of the hobby; this can get confusing with the newer use of the term “aged water,” as being fresh-drawn tap water (intended for PWC use) which has been “aged” for a brief time before use, to allow the pH to adjust and/or to allow chlorine gases to escape. It’s often just referred to as “tank water” (with no “aged” prefix).
Yes, agreed, when filling your hospital tank with 100% (treated) tap water, after emptying it, this would be considered as much of a 100% water change as replacing all (100%) of your tank water — as its all NEW, as opposed to “tank water” in which the fish are presently living in, promoting wastes and excreting hormones. In any case however, before using your hospital tank for a fish coming from your aquarium, you should first test it and either adjust it if needed (if much different than your tank water) or acclimate your sick fish slowly to it.
I totally understand your confusion in the situation of your moving to a new water source. In this case since we are dealing with the introduction of quite possibly entirely different (or at least a different water source) this is a more unique situation which seldom is dealt with outside of moving, with the exception of a single breeding establishment using two or more different types of water (from the same source) by employing reverse osmosis or by adding carbonates to the water.
Different sources of water, as in your well water, need to be defined as the “Change” or “Changing” water of your PWC’s with your old (in this case “previous”) tap water in order to understand that the well water is the water doing the PWC’s — actually changing the nature of the water mixture in various percentages with each PWC. While the portion of fresh tap water you are using new daily for this fish is water that they have gotten used to (adapted to), they have not yet adapted to the well water and are being acclimated to it. This is where “partial water changing” comes in, in this context, in adjusting the fish to entirely new water conditions, but to be understood at the time, it must be differentiated from normal water changing without considering the tap water as new water in such water changes (even if it is fresh) — as now only the well water is actually “new.” Ray
Category: Philippines Internet Koi Society
