my unit actually is an old aquasafe.
i just added an inline tds meter, backflush valve and use the third 10" canister for my DI. i have an extra valve to divert the ro output down the drain until it's around 2TDS before allowing it to enter the resin. The ro output spikes to around 80 at first and within 20 seconds currently it falls to 2 or 1.
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