Kl420 said:

Hello everyone,

I'm a third time grower and finally have decided to use perlite for my next grow. As it is not available in my country I have come to another and is gonna buy from here and go back. So I would to get some advice on how much perlite I'll have to buy.

Usually one of my pots hold around 10kg of moist soil, I'd say roughly will be like a 30 litre (7 gal) pot. How much perlite in weight would you recommend?

Thanks in advance

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Buzzzz said:

Take some soil add perlite ,then water it and squeeze a sample in your hand,if it stays soggy,holds tight and doesn't easily crumble add more until you reach the fine line. This provides air and avoids wet spots. I run promix 60/40 perlite for explosive root growth but it means I have to water/feed more and stake the plants,the more perlite you add,the closer you go to hydroponics

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Kl420 said:

Hello everyone,

I'm a third time grower and finally have decided to use perlite for my next grow. As it is not available in my country I have come to another and is gonna buy from here and go back. So I would to get some advice on how much perlite I'll have to buy.

Usually one of my pots hold around 10kg of moist soil, I'd say roughly will be like a 30 litre (7 gal) pot. How much perlite in weight would you recommend?

Thanks in advance

Click to expand...

mysticepipedon said:

When you buy a bag of perlite or other medium, they usually include the volume as well as the weight.

Perlite has a bulk density ranging between 32 and 400 kg/m3, so without knowing where your perlite would fall in that range, no one can give you the weight.

If you want 30% perlite, you need 10 liters per pot. If it has a bulk density of 32 kg/m3, that would be 0.32 kg of perlite per pot. If it was 100 kg/m3, it would be 1 kg of perlite per pot

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