Which backpack to use with TFR

Hi guys,

Looking to purchase a battery backpack for cleaning facias, gutters etc, so TFR chemicals will be used and stored within container.

I'm a little worried about using TFR chemicals through the pump as it could damage/reduce life of pump.

Can anyone recommend one.

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Most backpacks will be OK, just flush out after

they all have vitron seals mate so the backpacks are safe for chems anyway,as mentioned earlier it would be good pratice to flush it all out afterwards and run a few litres of fresh water through the pump to keep the seals sweet,