Apple cider vinegar can be diluted half-and-half with water for external application, and, when stronger measures are needed, it can be used full-strength.
1 Just the stone for a flagstone patio can cost $3 -$5 a square foot or more, depending on location and the type and quality of stone, or about $600 -$1,000 for an average patio up to 10'x20,' and $1,200 -$2,000 for a larger 20'x20' area.
What should be included: 1  Just the stone for a flagstone walkway can cost $2.50 -$5 or more a square foot, depending on location and the type and quality of stone, or about $300 -$1,000 for a typical walkway.hat should be included: 1  Just the stone for a flagstone walkway can cost $2.50 -$5 or more a square foot, depending on location and the type and quality of stone, or about $300 -$1,000 for a typical walkway.