diff --git a/puremd_rc_1003/environ/param.gpu.water b/puremd_rc_1003/environ/param.gpu.water
index a507d140ddc6ab93c60c092337827a44da0e5c87..061aad32e64e6d53543fa3ff073067352ce10b93 100644
--- a/puremd_rc_1003/environ/param.gpu.water
+++ b/puremd_rc_1003/environ/param.gpu.water
@@ -14,8 +14,10 @@ bond_graph_cutoff	0.3			! bond strength cutoff for bond graphs
 thb_cutoff		0.001	  		! cutoff value for three body interactions
 hbond_cutoff		7.50			! cutoff distance for hydrogen bond interactions
 q_err			1e-6		     	! relative residual norm threshold used in GMRES
-ilu_refactor		100			! nsteps to recompute incomplete LU factorization
-ilu_droptol		0.01			! threshold tolerance for dropping values in ILU
+solver			2			! method used to solve charge equilibration phase (QEq)
+pre_comp		1			! method used to compute QEq preconditioner, if applicable
+pre_refactor		100			! nsteps to recompute preconditioner
+pre_droptol		0.01			! threshold tolerance for dropping values in preconditioner computation, if applicable
 
 temp_init	      	0.0             	! desired initial temperature of the simulated system
 temp_final 	      	300.0	        	! desired final temperature of the simulated system