papaBear, if you read the woman's comments carefully, she was saying that certain sulfates (which can definitely affect ph), and probably sulfur dioxide, will get in the water if there are shifts in the plates at all. An earthquake at depths are not always even felt or detectable on the surface, and happen all the time as part of nature. The plates shift all the time as they are floating in lava, and even a little nudge can release volumes of stuff. It is quite possible he has had a recent shift down there that has affected the water. The test results I have found on the site so far are at least a year old, and indicate high nitrates-
08/23/0511/22/05NITRATE (AS N) EP-A0.340000010.000000MG/L
and arsenic.
But given the age of the results, does not mean it doesn't have other things now too.
Birdman, by the time you pay for the chemicals and UV lights, you will have spent more than buying a couple 20" canisters and some cartridges specifically targeting problem or concern areas.
I understand what the woman is saying about the water, although surface contaminants are not a concern, other things most certainly are more likely to occurr down there than in a shallow well. She sounds almost more like a salesman or
pr person worried about bad press than a tech. I studied physical geography and she is heralding th good points in the well while sort of stuffing the risks and concerns under the rug. Deep water does not equal healthy water. 'Pure' is a
pr term.
Sun spots could certainly play a role. It may be a larger fish load and feed change are what is making the filtration come up short, if it is. Once the algae is dead another accurate test on nitrates will reveal alot more. It could be the filter was removing the nitrates and arsenic in the source water, but with added fish load isn't quite getting it done now. The algae could be consuming the leftover nitrate, fueling it's growth, and making the tests read 0. As you add fish and filter and feed load a shower is going to be more and more essential, and one does not need to be expensive. You can get pumps off of ebay for very cheap and use milk or other plastic crates for your media.
I think one test you need to do is what JR suggested if you haven't, to put some media and water in a drum for a couple weeks and test it. See if the rocks are leaching anything.
Your plants and lily pond will actually like the nitrates. Not too sure how they enjoy arsenic though.