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Dealing with seasonal variations of GH in public water supply where RO water is not a feasible option

Pepere

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Following @Dennis Wong advise to hold growth variables as steady as possible to avoid transition stress has been my single greatest tool to aquatic plant success.

I am fortunate to have Tap Water that is consistent all season with 6 ppm Ca, 1 ppm Mg day in day out all year. It is consistent because the water utility adds most of the Calcium and Magnesium in it.. the source water is extremely soft. The head of the water department has told me it never gets close to their target. They continually test and adjust the feed to hit target.

It is simple enough for me to just add gypsum and epsom salt to boost it to what I want.

Helping a fellow member here who is starting a 75 gallon tank in an apartment. Ro unit is simply not an option for him in the apartment for now. schlepping bottles of RO for a 75 gallon would also be a hardship. It is a tank just for family enjoyment and not intended to be a competition tank. He will be dosing diy ferts, high light and co2.

His public water supply has an average DGH of 8 with reasonable calcium magnesium balance. But the Seasonal variation is between 4.5 DGH and 11.2 DGH…

In the situation where RO is not currently an option what would peoples responses be?

At 8 DGH, I would probably just go with it. It is a tank just for personal enjoyment and

It would be easy enough to test tap water DGH before doing a water change. It would be easy enough to create a table to alter how much to-adjust gypsum and epsom salts as tap water hardness decreases with seasonal shifts down to 4.5. But the question is for the times it hops upwards to high end of range.

One could schlepp bottles for those weeks and hope those weeks are outliers…

Or one could simply target a higher DGH all of the time in the interest of stability..

So I understand the potential issues, but not enough of what numbers matter…

Am I overthinking? I know @Dennis Wong has said the Carbonate hardness has a bigger impact on plant health than General Hardness,

Is ranging General Hardness less of a concern?

Water report indicates 3.5 DKH with no report regarding seasonal variation..
 

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