The ornamental design for the grate grill for swim spas, as shown and described.
FIG. 1 is a front perspective view of the grate grill for swim spas showing our new design.
FIG. 2 is a front view of the grate grill for swim spas.
FIG. 3 is a back view of the grate grill for swim spas.
FIG. 4 is a left side view of the grate grill for swim spas.
FIG. 5 is a right side view of the grate grill for swim spas.
FIG. 6 is a top view of the grate grill for swim spas.
FIG. 7 is a bottom view of the grate grill for swim spas.
FIG. 8 is a front perspective view of a grate grill for swim spas showing our new design according to a second embodiment.
FIG. 9 is a front view of the grate grill for swim spas according to the second embodiment.
FIG. 10 is a back view of the grate grill for swim spas according to the second embodiment.
FIG. 11 is a right side view of the grate grill for swim spas according to the second embodiment.
FIG. 12 is a left side view of the grate grill for swim spas according to the second embodiment.
FIG. 13 is a top view of the grate grill for swim spas according to the second embodiment; and,
FIG. 14 is a bottom view of the grate grill for swim spas according to the second embodiment.
The broken lines showing the figures are for the purpose of illustrating portions of the grate grill for swim spas and form no part of the claimed design.