By using quality products derived from current technology, and by making timely and properly made applications of pre-emergents, one can achieve a healthy and good looking lawn while minimizing the need for “chemicals” to do so. The key is indeed to do things right and on time!!
Good cultural practices, including proper mowing and aeration, are essential as well.
The pictures below show a virtually weed free lawn treated (on time) by SongBird, and an untreated lawn.
The old adage “an ounce of prevention is worth a pound of cure”, applies here.