diff --git a/src/algorithms/ctmrg/ctmrg.jl b/src/algorithms/ctmrg/ctmrg.jl
index 8e47d14f..e35abeaf 100644
--- a/src/algorithms/ctmrg/ctmrg.jl
+++ b/src/algorithms/ctmrg/ctmrg.jl
@@ -92,31 +92,6 @@ function _singular_value_distance((S₁, S₂))
     end
 end
 
-function build_projectors(
-    U::AbstractTensorMap{E,2,1},
-    S::AbstractTensorMap{E,1,1},
-    V::AbstractTensorMap{E,1,2},
-    Q::AbstractTensorMap{E,2,2},
-    Q_next::AbstractTensorMap{E,2,2},
-) where {E<:ElementarySpace}
-    isqS = sdiag_pow(S, -0.5)
-    P_left = Q_next * V' * isqS
-    P_right = isqS * U' * Q
-    return P_left, P_right
-end
-function build_projectors(
-    U::AbstractTensorMap{E,2,1},
-    S::AbstractTensorMap{E,1,1},
-    V::AbstractTensorMap{E,1,2},
-    Q::EnlargedPartitionFunctionCorner,
-    Q_next::EnlargedPartitionFunctionCorner,
-) where {E<:ElementarySpace}
-    isqS = sdiag_pow(S, -0.5)
-    P_left = left_projector(Q.E_1, Q.C, Q.E_2, V, isqS, Q.partfunc)
-    P_right = right_projector(Q_next.E_1, Q_next.C, Q_next.E_2, U, isqS, Q_next.partfunc)
-    return P_left, P_right
-end
-
 """
     calc_convergence(envs, CS_old, TS_old)
     calc_convergence(envs_new::CTMRGEnv, envs_old::CTMRGEnv)