PH not staying stabilized

I'm running a hydro drip feed to reservoir and I adjust my PH to 5.5 but when the pump starts after e few minute it going up again to 7.8 my medium is gravel

sounds like your gravel is putting ph out. did you soak gravel before putting plants in

jafooli said:

sounds like your gravel is putting ph out. did you soak gravel before putting plants in

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I second this. Your gravel is probably the culprit. Gravel doesn't sound like a very good medium anyway.

I thought about that that the gravel may be the problem but for me to get another medium here on the island is very difficult but the gravel I can use it again an again just wash it and it ready again and i having good results from my plant I just wanted to see if I will get better result if the PH was stable

What island? Can I come and hang out?

that doesnt look like normal gravel. it looks to be more mineral. be carefull.

My first grow was in pea stone gravel and had no problems, that stuff you have looks quite different, I agree with superstoner looks more mineral, could it be lime stone?

Giligans island? I'd bang ginger and mary
ann...say hi to the skipper for me

Looks like ground up lime stone, this would cause huge ph swings

go nft, no medium

I might have problem Ithink with NFT because here ON the island it's hot 30-40C and I plant outdoors

Dee Tee you were right it not normal gravel it limestone I didn't know I went to the company website and it's Special fine ground limestone for:

- Agricultural sector
- Cattle- and poultry feed
- Soil improvement
- Soil acidity control
- Agricultural and market gardening so now I know why my PH keep on going to 7 it's a Soil acidity control

Here is a pic of the plants it's white widow from .greenhouseseeds.nl but it does not look like white widow strange