Tap water off a well

[Tony ynoT]

I'm running water changes through an r/o system and can barely get the gh/kh back up to suitable levels. Gh =25ppm kh= 80 ppm barely, and the ph hangs around 7. Any tips on raising these levels suitable to maintain guppies and snails in same tank. 

[Daniel]

Seachem Equlibrium works well:

https://www.aquariumcoop.com/collections/water-care/products/seachem-equilibrium

[gardenman]

Some crushed coral/aragonite mixed in the gravel or stashed in the filter can help a bit.

[Hobbit]

I’m in the same boat as you. I add a combination of baking soda, cichlid or shrimp salts, and crushed limestone (calcium carbonate) whenever I change water. I also add crushed oyster shell to the substrate.