Good pressure at the start of the game almost resulted in the Reds taking an early lead on seven minutes.
Rebecca Worthington, on the right-hand side, got down towards the line and put in a cross; although there were two players running in on goal, neither of them could connect.
Patience and good play paid off in the 19th minute with Jude Chapman playing a great ball from midfield.
Kiery Horne picked up the pass and played an almost identical cross to Worthington’s earlier attempt.
This time, forward Fran Summers on was the end of it with a first-time hit in front of goal.
Two minutes later and Summers scored again; another similar goal with Di Roe being the provider this time but for a more central position.
Garstang almost made it three goals in six minutes when Alice Marsden smashed the ball in from the left wing and Horne, on the right-hand post, forced a superb paddle save from the Formby keeper’s left hand.
Moments later, Summers reverse hooked a high ball in towards the goal which would have gone in had the in-form keeper not tipped it over, capping a fantastic 10- minute spell for the home side.
Gemma Trickett almost got in on the act just before half-time with a low shot to the keeper’s right but she got down to the ground quickly and made a great save with her stick.
Garstang didn’t want half-time to come, after which a buoyed Formby side started well but conceded a penalty flick only three minutes later when a defender ran into another Worthington effort.
Worthington calmly converted the flick to the left, high into the roof of the net and giving the flailing keeper no chance.
Three goals ahead and the Reds were coasting as it took another 15 minutes for the game’s first penalty corner.
A slip to Alice Marsden and a great strike followed but it was just off target.
The game then became a dogged affair with lots of midfield tussles as Jen Moss battled away while Jude Chapman, Lyndsey Hayes and Lily Helme stuck tightly to their players and without giving Formby much chance to put anything together.
Defenders Lindsay Thornhill, Donna Richardson and Georgie Brumwell had a relatively quiet day, protecting keeper Alanis Parkinson and neatly clearing up any sign of a Formby attack.
They did concede two penalty short corners but neither came to anything.
The Reds were not done yet though as Worthington, on the right-hand side, put in some excellent balls.
Trickett got on the end of that service, only for one strike to hit the keeper’s helmet and another thwarted by the keeper’s diving save.
However, Trickett made it third time lucky not long afterwards following another cross from Worthington.
She made it 4-0 and got her third of the season when she ran towards the ball and, with a first-time effort, hit it past the stranded keeper.
Garstang played some really good hockey at times and created lots of chances.
Had it not been for the heroics of the Formby keeper the scoreline could easily have been doubled.
The only slight was an injury to Jen Moss who fell awkwardly, twisting her knee.
Nevertheless, victory made it six wins from eight ahead of their next game with local rivals, mid-table Longridge.