Anything acidic. Lemon juice or vinegar. Soma the seed breeder has some great natural techniques and grows in soil with soul. Some of my favourite cannabis reading.
If your adding nutes to your tap water then they will lower it down to 5.7-6.4.
What exacaly is it you want to do? And the pic you put upid say she needs some grow bro shes lacking in N big time. Also if shes indoors now then get rid of that bug dust bro:thumbs:
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