What products/components commonly used in a hydro system cause the pH to spike?
What are your experiences?
What should you avoid or not do?

My understanding is that food grade plastics are better. And I've noticed a lot of people use Rubbermaid tubs. Unfortunately, where I live that brand is not available.

There are currently no plants in my new setup, but after adding tap water at around 5.5 (yellow) to the system and running it for a few days it has a ph of at least 8 (blue). My first thoughts are that the fly screen is to blame. I washed it in a weak bleach solution then rinsed very well prior to use. And yes, I am aware that bleach is very alkaline.

I'm currently running a test to see if the problem lies with the tubs, or the fly screen I acquired to prevent medium loss. The medium is perlite.
Itâ??s no big deal if I have to change it, as none of the materials in question have cost me anything so far. And obviously I'd rather get a stable pH prior to use. Is there something else that could be causing this problem? Any ideas on preventing medium leakage from pots using something pH stable? I will probably get new pots and drill my own drainage holes if the fly screen turns out to be the problem.

Gen, did you have any problems using those stockings to hold the root ball? Please advise as it seemed like a great idea.

Thanks to all.
elcheapo Reviewed by elcheapo on . pH problems - What to avoid? What products/components commonly used in a hydro system cause the pH to spike? What are your experiences? What should you avoid or not do? My understanding is that food grade plastics are better. And I've noticed a lot of people use Rubbermaid tubs. Unfortunately, where I live that brand is not available. There are currently no plants in my new setup, but after adding tap water at around 5.5 (yellow) to the system and running it for a few days it has a ph of at least 8 (blue). My first Rating: 5