Yes, you can buy pH up, or you can use baking soda... But if you have soft water (sodium is used to soften it), using baking soda (sodium bicarbonate) might be ill-advised, as it might give your plants too much sodium.

Even with a pH kit that only goes to 6, you can estimate a lower pH. If you're using a Wadley Jr. kit, a pale yellow with no hint of green or orange is about 5.8. (5.5-5.9 is optimal to avoid any nute lock-out.)

I'd recommend getting a wider-range pH kit & some pH down. You could also use store-bought water, but I think the former is a better longterm solution, as long as your plants seem happy in your water.

Green thumb to ya!
mackSwell Reviewed by mackSwell on . Need a little advice. I have just started my first hydroponic grow, think it going ok so far, my plants have been in the big blocks for about 6 week's (see photo) and now using half strength canna aqua vega 1&2 , just need a bit of advice on when to start 12/12 with my hps. Has anyone had trouble when you add the aqua vega messing with the ph, i have soft water where i live and only need to bring the ph down a fraction, when i add the aqua vega the ph is too low and cant get it up without losing alot of water and Rating: 5