Grow Mediums How often should I change nutes in buckets?

[Surfer Joe]

I am doing a bucket hydro grow in 20L buckets with airstones.
The plants are in the middle bloom stage, lots of small buds still needing to bulk up and fill in the gaps in the colas. It has a massive rootball and is very bushy with lots of leaves and bud sites.

I tend to replace the bucket every 7 or 8 days with fresh nutes.
In between, I only top up with water at pH 5.7.
The plant uses about 3.6L a day right now to keep topped up to just below the mesh pot level.
I notice that the ppms go down for the first 4 or 5 days and then stop decreasing until I change the nutes and it starts over again.

But I am wondering if I should change the buckets sooner?
If the ppms go down for the first 4 days and then stop decreasing, should I switch buckets then or keep topping up with water for a full 7-8 days before switching?

 

[DWCocha]

sounds like things are going great dude :Sharing One:
good question too ! .................................................................................... i'll think about the answer for a while ???,maybe someone else can chime in coz im stoned

but your underfeeding right now ,i would up PPM by 100 ,by increasing supps like boost & your base bloom nutes ect. Don't be scared to get a bit of tip burn & have the PPM rize a bit ... just bring them back down with water after a day or two & you know shes getting enough feed ...

Do you have PK boost Jo

Im in mid bloom now & just started PK week @ 100 ppm higher than she can take ... getting tip burn & topping off with plain water (goes back down 100PPM) then res change tomorrow & same again for a few more days until the week is up ... thats what you work up to with all your nutes & then she can have a lower PPM for a week before flushing maybe ?

im rambling ,you get the idea bud

 

[Surfer Joe]

Thanks.
I do use the canna boost, and also got some bud xl to start adding in hopes of getting fatter buds.
I used PK at half strength last nute change but since canna offers no great info on which week to use it, I plan to use it for two nute changes.