I have a script that recomposes pools automatically. It uses some of the VMware.HV.Helper module.
Below is a snippet of how I get the pool name, get the master image name, get the location in vsphere, delete the old parent image, create a new parent image, create a new snapshot for the new parent image, and finally recompose the pool with a new parent image.
WARNING: These are just snippets of working code so you'll have to modify alot of this. Don't just try to run this because it won't work without tailoring it to your environment.
$PoolName = ((Get-HVPool -HvServer $connect) | where {$_.base.name -notlike 'Persistent*'})
$MASTERIMAGENAME = get-vm -Server $vsphere | where {$_.Name -eq $($MASTERIMAGE)}
$location = Get-folder 'C-Parent-Images' -Server $vsphere
get-vm -Name "$($CPOOLS)-Parent-$($date)" -Server $vsphere | Remove-VM -DeletePermanently -Server $vsphere -Confirm:$false
$parentvm = New-VM -Name "$($CPOOLS)-Parent-$($date)" -VM $MASTERIMAGENAME -Server $vsphere -ResourcePool 'VDI' -Datastore 'VDI - VMS' -Location $location
$NewSnap = New-SnapShot -VM $parentVM -name "$($CPOOLS)-Parent-$($date)" -Server $vsphere
do {write-host "snapping..." | out-string; start-sleep -sec 1}
until (get-snapshot -vm $parentVM -name "$($CPOOLS)-Parent-$($date)" -ErrorAction SilentlyContinue -Server $vsphere)
start-hvpool -Pool $PoolName -Recompose -ParentVM $parentVM -SnapshotVM $newsnap -LogoffSetting FORCE_LOGOFF -HvServer $connect
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