How to adjust the transparency of the shader?

I use a shader HeatDisort of package detonator Asset Store. But it makes my water (Water4) transparent, that does not look very pretty.

I'm not good at shaders, so they could not set up, tell me what I need to change in the shader?

 // Per pixel bumped refraction.
 // Uses a normal map to distort the image behind, and
 // an additional texture to tint the color.
 
 Shader "HeatDistort" {
 Properties {
     _BumpAmt  ("Distortion", range (0,128)) = 10
     _MainTex ("Tint Color (RGB)", 2D) = "white" {}
     _BumpMap ("Normalmap", 2D) = "bump" {}
 }
 
 CGINCLUDE
 #pragma fragmentoption ARB_precision_hint_fastest
 #pragma fragmentoption ARB_fog_exp2
 #include "UnityCG.cginc"
 
 sampler2D _GrabTexture : register(s0);
 float4 _GrabTexture_TexelSize;
 sampler2D _BumpMap : register(s1);
 sampler2D _MainTex : register(s2);
 
 struct v2f {
     float4 vertex : POSITION;
     float4 uvgrab : TEXCOORD0;
     float2 uvbump : TEXCOORD1;
     float2 uvmain : TEXCOORD2;
 };
 
 uniform float _BumpAmt;
 
 
 half4 frag( v2f i ) : COLOR
 {
     // calculate perturbed coordinates
     half2 bump = UnpackNormal(tex2D( _BumpMap, i.uvbump )).rg; // we could optimize this by just reading the x & y without reconstructing the Z
     float2 offset = bump * _BumpAmt * _GrabTexture_TexelSize.xy;
     i.uvgrab.xy = offset * i.uvgrab.z + i.uvgrab.xy;
     
     half4 col = tex2Dproj( _GrabTexture, i.uvgrab.xyw );
     half4 tint = tex2D( _MainTex, i.uvmain );
     return col * tint;
 }
 ENDCG
 
 Category {
 
     // We must be transparent, so other objects are drawn before this one.
     Tags { "Queue"="Transparent+100" "RenderType"="Opaque" }
 
 
     SubShader {
 
         // This pass grabs the screen behind the object into a texture.
         // We can access the result in the next pass as _GrabTexture
         GrabPass {                            
             Name "BASE"
             Tags { "LightMode" = "Always" }
          }
          
          // Main pass: Take the texture grabbed above and use the bumpmap to perturb it
          // on to the screen
         Pass {
             Name "BASE"
             Tags { "LightMode" = "Always" }
             
 CGPROGRAM
 #pragma vertex vert
 #pragma fragment frag
 
 struct appdata_t {
     float4 vertex : POSITION;
     float2 texcoord: TEXCOORD0;
 };
 
 v2f vert (appdata_t v)
 {
     v2f o;
     o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
     #if UNITY_UV_STARTS_AT_TOP
     float scale = -1.0;
     #else
     float scale = 1.0;
     #endif
     o.uvgrab.xy = (float2(o.vertex.x, o.vertex.y*scale) + o.vertex.w) * 0.5;
     o.uvgrab.zw = o.vertex.zw;
     o.uvbump = MultiplyUV( UNITY_MATRIX_TEXTURE1, v.texcoord );
     o.uvmain = MultiplyUV( UNITY_MATRIX_TEXTURE2, v.texcoord );
     return o;
 }
 ENDCG
         }
     }
 
     // ------------------------------------------------------------------
     // Fallback for older cards and Unity non-Pro
     
     SubShader {
         Blend DstColor Zero
         Pass {
             Name "BASE"
             SetTexture [_MainTex] {    combine texture }
         }
     }
 }
 
 }
 

I tried the "Queue" = "Transparent-200", but this does not help.