Automatic top off

[Tom]

Does anyone know how much I'll screw up my PH if I top off my evaporation with straight RO. I am moving my tank in a week or so (after much planning!) and am trying to automate as much as possible (I travel often). I am adding a calcium reactor to help with making things stable. I am hoping the higher dKH help keep things from dropping like it has in the past with out the reactor. Any other suggestions?

[cyberdude4747]

It all depends on your evaporation rate and tank volume
I like to use caribsea's aragramight works pretty good for R/o top up water,If your evaporation rate is quite high you could have a drop in alk... In R/o water (depending on the model) the alklinity is usaully pretty low and can lower overall tank alk...

[tendar]

I am always fighting low alk and top off with plain ro/di water but some day when I add a cal reactor it should fix that.

[Tom]

I am looking to put a float valve in the sump straight from the RO...a 30gpd 3 stage unit...my tank loses about 2.5 gallons a day...I top off with a kalk drip now to keep up alk and PH but refilling the the drip box is a pain...and doesn't allow me away from the tank for more than three days tops! I know RO is low in both areas...will the calc reactor help keep it from dropping that much?