Preservative for an O/W emulsion with 20% of Kaolin clay

Hi All,

I formulated face gommage (gentle scrub) with a high content of clay. This is a O/W emulsion and I am concerned about preservative. As far as I know it is difficult to preserve clay. I can not decrease it's amount, because it's a buffer scrub and it suppose to peel off, so I need quite a lot of clay. Currently I preserve it with Phenoxyethanol & Ethylhexylglycerin, but I suspect it's not enough. Would parabens be more effective, or I should use a combination of parabens and Phenoxyethanol & Ethylhexylglycerin?

Aqua 59.80%
Cetearyl alcohol and PEG-20 Stearate 8.00%
Fractionated coconut oil 6.00%
Cetyl Alcohol 5.00%
Tocopherol 0.20%
Kaolin Clay 20.00%
Phenoxyethanol & Ethylhexylglycerin 1.00%
Jojoba beads qs
 
Thank you in advance!

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