You’ll be just fine. You can use all four if you wish for faster drip. We have the Big Berkey, hold about 1.75 gallons at a time. Just pay attention on how to prime and test filters first time around. Everything will be fine. You will love it. We use ours on the road during our fair season...
We tried ours on our creek water... we first strained through a T-shirt, then boiled, then ran through then Berkey. It worked great!
We won’t need it, hopefully, as we are on a water well.
I purchased it YEARS ago, during 0s reign, and we used it for about six months. Our well water tests out very good, thankfully.
BUT...you never know, so it’s just a good thing to have...in case we ever have to use other sources of water.