Chloramine breaks down to halo methanes over time so, no buildup.
And, it is usually measured in parts per billion so It would take years if it did.

However, from your description, it sounds like your water is chock full of alkaline salts.
So, your PH down is producing salts that will accumulate.

Chasing alkaline water with PH down is like playing peek-a-boo with a 2 year old, it never ends.

And not for nothin', PH readings on distilled water are meaningless because most PH meters actually read conductance.
Distilled water is an insulator, no conductance to read.

Aloha,
Weeze
Weezard Reviewed by Weezard on . chloramine is the devil bobby boucher!!!!! sorry about the waterboy reference but it makes sense kinda. after 30 some odd seedlings and mountains of reading and tearing my hair out i might have actually figured this out.. maybe. every seedling i have started and yeah it is really around 30 or so since early november has developed yellowing and rapid chlorotic/necrotic leaves within 2 - 3 weeks ultimately killing them all. No matter what i try the perk up and then get worse and die off. always showing signs of some kind of Rating: 5